diff --git a/include/boost/static_string/static_string.hpp b/include/boost/static_string/static_string.hpp
index b899d54..fae3dea 100644
--- a/include/boost/static_string/static_string.hpp
+++ b/include/boost/static_string/static_string.hpp
@@ -145,31 +145,36 @@ struct is_string_like<
 // directly and other convertible types such as std::string.
 // When no string_view type is available, then we check for the
 // data and size member functions, and use them directly for assignments.
-template<typename T, typename CharT, typename Traits, typename = void>
+// Types convertible to basic_static_string are not considered viewable
+// to prevent any ambiguity during overload resolution.
+template<std::size_t N, typename T, typename CharT, typename Traits, typename = void>
 struct enable_if_viewable { };
 
-template<typename T, typename CharT, typename Traits>
-struct enable_if_viewable<T, CharT, Traits,
+template<std::size_t N, typename T, typename CharT, typename Traits>
+struct enable_if_viewable<N, T, CharT, Traits,
     typename std::enable_if<
 #if !defined(BOOST_STATIC_STRING_HAS_ANY_STRING_VIEW)
-        is_string_like<T, CharT>::value
+        is_string_like<T, CharT>::value &&
+        !std::is_convertible<const T&, const basic_static_string<N, CharT, Traits>&>::value
 #elif defined(BOOST_STATIC_STRING_STANDALONE)
         std::is_convertible<const T&, std::basic_string_view<CharT, Traits>>::value &&
-        !std::is_convertible<const T&, const CharT*>::value
+        !std::is_convertible<const T&, const CharT*>::value &&
+        !std::is_convertible<const T&, const basic_static_string<N, CharT, Traits>&>::value
 #else
         (
             std::is_convertible<const T&, basic_string_view<CharT, Traits>>::value ||
             std::is_convertible<const T&, core::basic_string_view<CharT>>::value
         ) &&
-        !std::is_convertible<const T&, const CharT*>::value
+        !std::is_convertible<const T&, const CharT*>::value &&
+        !std::is_convertible<const T&, const basic_static_string<N, CharT, Traits>&>::value
 #endif
     >::type>
 {
   using type = void;
 };
 
-template<typename T, typename CharT, typename Traits>
-using enable_if_viewable_t = typename enable_if_viewable<T, CharT, Traits>::type;
+template<std::size_t N, typename T, typename CharT, typename Traits>
+using enable_if_viewable_t = typename enable_if_viewable<N, T, CharT, Traits>::type;
 
 // The common string_view type used in private operations with enable_if_viewable_t
 // - T const& itself when no string_view type is available
@@ -1117,7 +1122,7 @@ public:
   */
   template<typename T
 #ifndef BOOST_STATIC_STRING_DOCS
-    , typename = detail::enable_if_viewable_t<T, CharT, Traits>
+    , typename = detail::enable_if_viewable_t<N, T, CharT, Traits>
 #endif
   >
   explicit
@@ -1137,7 +1142,7 @@ public:
   */
   template<typename T
 #ifndef BOOST_STATIC_STRING_DOCS
-    , typename = detail::enable_if_viewable_t<T, CharT, Traits>
+    , typename = detail::enable_if_viewable_t<N, T, CharT, Traits>
 #endif
   >
   BOOST_STATIC_STRING_CPP14_CONSTEXPR
@@ -1314,7 +1319,8 @@ public:
 
       @code
       std::is_convertible<const T&, string_view>::value &&
-      !std::is_convertible<const T&, const CharT*>::value
+      !std::is_convertible<const T&, const CharT*>::value &&
+      !std::is_convertible<const T&, const basic_static_string&>::value
       @endcode
 
       @return `*this`
@@ -1325,7 +1331,7 @@ public:
   */
   template<typename T
 #ifndef BOOST_STATIC_STRING_DOCS
-    , typename = detail::enable_if_viewable_t<T, CharT, Traits>
+    , typename = detail::enable_if_viewable_t<N, T, CharT, Traits>
 #endif
   >
   BOOST_STATIC_STRING_CPP14_CONSTEXPR
@@ -1603,7 +1609,8 @@ public:
 
       @code
       std::is_convertible<const T&, string_view>::value &&
-      !std::is_convertible<const T&, const CharT*>::value
+      !std::is_convertible<const T&, const CharT*>::value &&
+      !std::is_convertible<const T&, const basic_static_string&>::value
       @endcode
 
       @return `*this`
@@ -1614,7 +1621,7 @@ public:
   */
   template<typename T
 #ifndef BOOST_STATIC_STRING_DOCS
-    , typename = detail::enable_if_viewable_t<T, CharT, Traits>
+    , typename = detail::enable_if_viewable_t<N, T, CharT, Traits>
 #endif
   >
   BOOST_STATIC_STRING_CPP14_CONSTEXPR
@@ -1648,7 +1655,8 @@ public:
 
       @code
       std::is_convertible<const T&, string_view>::value &&
-      !std::is_convertible<const T&, const CharT*>::value
+      !std::is_convertible<const T&, const CharT*>::value &&
+      !std::is_convertible<const T&, const basic_static_string&>::value
       @endcode
 
       @return `*this`
@@ -1664,7 +1672,7 @@ public:
   */
   template<typename T
 #ifndef BOOST_STATIC_STRING_DOCS
-    , typename = detail::enable_if_viewable_t<T, CharT, Traits>
+    , typename = detail::enable_if_viewable_t<N, T, CharT, Traits>
 #endif
   >
   basic_static_string&
@@ -2594,7 +2602,8 @@ public:
       @par Constraints
 
       `std::is_convertible<const T&, string_view>::value &&
-      !std::is_convertible<const T&, const CharT*>::value`.
+      !std::is_convertible<const T&, const CharT*>::value &&
+      !std::is_convertible<const T&, const basic_static_string&>::value`.
 
       @param index The index to insert at.
       @param t The string to insert from.
@@ -2604,7 +2613,7 @@ public:
   */
   template<typename T
 #ifndef BOOST_STATIC_STRING_DOCS
-    , typename = detail::enable_if_viewable_t<T, CharT, Traits>
+    , typename = detail::enable_if_viewable_t<N, T, CharT, Traits>
 #endif
   >
   BOOST_STATIC_STRING_CPP14_CONSTEXPR
@@ -2635,7 +2644,8 @@ public:
       @par Constraints
 
       `std::is_convertible<const T&, string_view>::value &&
-      !std::is_convertible<const T&, const_pointer>::value`.
+      !std::is_convertible<const T&, const_pointer>::value &&
+      !std::is_convertible<const T&, const basic_static_string&>::value`.
 
       @return `*this`
 
@@ -2651,7 +2661,7 @@ public:
   */
   template<typename T
 #ifndef BOOST_STATIC_STRING_DOCS
-    , typename = detail::enable_if_viewable_t<T, CharT, Traits>
+    , typename = detail::enable_if_viewable_t<N, T, CharT, Traits>
 #endif
   >
   BOOST_STATIC_STRING_CPP14_CONSTEXPR
@@ -3006,7 +3016,8 @@ public:
 
       @code
       std::is_convertible<T const&, string_view>::value &&
-      !std::is_convertible<T const&, char const*>::value
+      !std::is_convertible<T const&, char const*>::value &&
+      !std::is_convertible<const T&, const basic_static_string&>::value
       @endcode
 
       @return `*this`
@@ -3017,7 +3028,7 @@ public:
   */
   template<typename T
 #ifndef BOOST_STATIC_STRING_DOCS
-    , typename = detail::enable_if_viewable_t<T, CharT, Traits>
+    , typename = detail::enable_if_viewable_t<N, T, CharT, Traits>
 #endif
   >
   BOOST_STATIC_STRING_CPP14_CONSTEXPR
@@ -3043,7 +3054,8 @@ public:
 
       @code
       std::is_convertible<T const&, string_view>::value &&
-      !std::is_convertible<T const&, char const*>::value
+      !std::is_convertible<T const&, char const*>::value &&
+      !std::is_convertible<const T&, const basic_static_string&>::value
       @endcode
 
       @return `*this`
@@ -3059,7 +3071,7 @@ public:
   */
   template<typename T
 #ifndef BOOST_STATIC_STRING_DOCS
-    , typename = detail::enable_if_viewable_t<T, CharT, Traits>
+    , typename = detail::enable_if_viewable_t<N, T, CharT, Traits>
 #endif
   >
   BOOST_STATIC_STRING_CPP14_CONSTEXPR
@@ -3181,7 +3193,8 @@ public:
 
       @code
       std::is_convertible<T const&, string_view>::value &&
-      !std::is_convertible<T const&, char const*>::value
+      !std::is_convertible<T const&, char const*>::value &&
+      !std::is_convertible<const T&, const basic_static_string&>::value
       @endcode
 
       @return `*this`
@@ -3192,7 +3205,7 @@ public:
   */
   template<typename T
 #ifndef BOOST_STATIC_STRING_DOCS
-    , typename = detail::enable_if_viewable_t<T, CharT, Traits>
+    , typename = detail::enable_if_viewable_t<N, T, CharT, Traits>
 #endif
   >
   BOOST_STATIC_STRING_CPP14_CONSTEXPR
@@ -3440,7 +3453,8 @@ public:
 
       @code
       std::is_convertible<const T&, string_view>::value &&
-      !std::is_convertible<const T&, const_pointer>::value.
+      !std::is_convertible<const T&, const_pointer>::value &&
+      !std::is_convertible<const T&, const basic_static_string&>::value.
       @endcode
 
       @return The result of lexicographically comparing `s` and the string.
@@ -3449,7 +3463,7 @@ public:
   */
   template<typename T
 #ifndef BOOST_STATIC_STRING_DOCS
-    , typename = detail::enable_if_viewable_t<T, CharT, Traits>
+    , typename = detail::enable_if_viewable_t<N, T, CharT, Traits>
 #endif
   >
   BOOST_STATIC_STRING_CPP14_CONSTEXPR
@@ -3484,7 +3498,8 @@ public:
 
       @code
       std::is_convertible<const T&, string_view>::value &&
-      !std::is_convertible<const T&, const_pointer>::value.
+      !std::is_convertible<const T&, const_pointer>::value &&
+      !std::is_convertible<const T&, const basic_static_string&>::value.
       @endcode
 
       @return The result of lexicographically comparing `s` and `sub`.
@@ -3497,7 +3512,7 @@ public:
   */
   template<typename T
 #ifndef BOOST_STATIC_STRING_DOCS
-    , typename = detail::enable_if_viewable_t<T, CharT, Traits>
+    , typename = detail::enable_if_viewable_t<N, T, CharT, Traits>
 #endif
   >
   BOOST_STATIC_STRING_CPP14_CONSTEXPR
@@ -3535,7 +3550,8 @@ public:
 
       @code
       std::is_convertible<const T&, string_view>::value &&
-      !std::is_convertible<const T&, const_pointer>::value.
+      !std::is_convertible<const T&, const_pointer>::value &&
+      !std::is_convertible<const T&, const basic_static_string&>::value.
       @endcode
 
       @return The result of lexicographically comparing `sub1` and `sub2`.
@@ -3552,7 +3568,7 @@ public:
   */
   template<typename T
 #ifndef BOOST_STATIC_STRING_DOCS
-    , typename = detail::enable_if_viewable_t<T, CharT, Traits>
+    , typename = detail::enable_if_viewable_t<N, T, CharT, Traits>
 #endif
   >
   BOOST_STATIC_STRING_CPP14_CONSTEXPR
@@ -3867,7 +3883,8 @@ public:
       @par Constraints
 
       `std::is_convertible<const T&, string_view>::value &&
-      !std::is_convertible<const T&, const CharT*>::value`.
+      !std::is_convertible<const T&, const CharT*>::value &&
+      !std::is_convertible<const T&, const basic_static_string&>::value`.
 
       @return `*this`
 
@@ -3880,7 +3897,7 @@ public:
   */
   template<typename T
 #ifndef BOOST_STATIC_STRING_DOCS
-    , typename = detail::enable_if_viewable_t<T, CharT, Traits>
+    , typename = detail::enable_if_viewable_t<N, T, CharT, Traits>
 #endif
   >
   BOOST_STATIC_STRING_CPP14_CONSTEXPR
@@ -3913,7 +3930,8 @@ public:
       @par Constraints
 
       `std::is_convertible<const T&, string_view>::value &&
-      !std::is_convertible<const T&, const CharT*>::value`.
+      !std::is_convertible<const T&, const CharT*>::value &&
+      !std::is_convertible<const T&, const basic_static_string&>::value`.
 
       @return `*this`
 
@@ -3930,7 +3948,7 @@ public:
   */
   template<typename T
 #ifndef BOOST_STATIC_STRING_DOCS
-    , typename = detail::enable_if_viewable_t<T, CharT, Traits>
+    , typename = detail::enable_if_viewable_t<N, T, CharT, Traits>
 #endif
   >
   BOOST_STATIC_STRING_CPP14_CONSTEXPR
@@ -4129,7 +4147,8 @@ public:
       @par Constraints
 
       `std::is_convertible<const T&, string_view>::value &&
-      !std::is_convertible<const T&, const CharT*>::value`.
+      !std::is_convertible<const T&, const CharT*>::value &&
+      !std::is_convertible<const T&, const basic_static_string&>::value`.
 
       @return `*this`
 
@@ -4142,7 +4161,7 @@ public:
   */
   template<typename T
 #ifndef BOOST_STATIC_STRING_DOCS
-    , typename = detail::enable_if_viewable_t<T, CharT, Traits>
+    , typename = detail::enable_if_viewable_t<N, T, CharT, Traits>
 #endif
   >
   BOOST_STATIC_STRING_CPP14_CONSTEXPR
@@ -4392,7 +4411,8 @@ public:
       @par Constraints
 
       `std::is_convertible<const T&, string_view>::value &&
-      !std::is_convertible<const T&, const CharT*>::value`.
+      !std::is_convertible<const T&, const CharT*>::value &&
+      !std::is_convertible<const T&, const basic_static_string&>::value`.
 
       @return The lowest index `idx` greater than or equal to `pos`
       where each element of `{sv.begin(), sv.end())` is equal to
@@ -4405,7 +4425,7 @@ public:
   */
   template<typename T
 #ifndef BOOST_STATIC_STRING_DOCS
-    , typename = detail::enable_if_viewable_t<T, CharT, Traits>
+    , typename = detail::enable_if_viewable_t<N, T, CharT, Traits>
 #endif
   >
   BOOST_STATIC_STRING_CPP14_CONSTEXPR
@@ -4549,7 +4569,8 @@ public:
       @par Constraints
 
       `std::is_convertible<const T&, string_view>::value &&
-      !std::is_convertible<const T&, const CharT*>::value`.
+      !std::is_convertible<const T&, const CharT*>::value &&
+      !std::is_convertible<const T&, const basic_static_string&>::value`.
 
       @return The highest index `idx` less than or equal to `pos`
       where each element of `{sv.begin(), sv.end())` is equal to
@@ -4562,7 +4583,7 @@ public:
   */
   template<typename T
 #ifndef BOOST_STATIC_STRING_DOCS
-    , typename = detail::enable_if_viewable_t<T, CharT, Traits>
+    , typename = detail::enable_if_viewable_t<N, T, CharT, Traits>
 #endif
   >
   BOOST_STATIC_STRING_CPP14_CONSTEXPR
@@ -4702,7 +4723,8 @@ public:
       @par Constraints
 
       `std::is_convertible<const T&, string_view>::value &&
-      !std::is_convertible<const T&, const CharT*>::value`.
+      !std::is_convertible<const T&, const CharT*>::value &&
+      !std::is_convertible<const T&, const basic_static_string&>::value`.
 
       @return The index corrosponding to the first occurrence of
       any of the characters in `{sv.begin(), sv.end())` within
@@ -4714,7 +4736,7 @@ public:
   */
   template<typename T
 #ifndef BOOST_STATIC_STRING_DOCS
-    , typename = detail::enable_if_viewable_t<T, CharT, Traits>
+    , typename = detail::enable_if_viewable_t<N, T, CharT, Traits>
 #endif
   >
   BOOST_STATIC_STRING_CPP14_CONSTEXPR
@@ -4849,7 +4871,8 @@ public:
       @par Constraints
 
       `std::is_convertible<const T&, string_view>::value &&
-      !std::is_convertible<const T&, const CharT*>::value`.
+      !std::is_convertible<const T&, const CharT*>::value &&
+      !std::is_convertible<const T&, const basic_static_string&>::value`.
 
       @return The index corrosponding to the last occurrence of
       any of the characters in `{sv.begin(), sv.end())` within
@@ -4861,7 +4884,7 @@ public:
   */
   template<typename T
 #ifndef BOOST_STATIC_STRING_DOCS
-    , typename = detail::enable_if_viewable_t<T, CharT, Traits>
+    , typename = detail::enable_if_viewable_t<N, T, CharT, Traits>
 #endif
   >
   BOOST_STATIC_STRING_CPP14_CONSTEXPR
@@ -4995,7 +5018,8 @@ public:
       @par Constraints
 
       `std::is_convertible<const T&, string_view>::value &&
-      !std::is_convertible<const T&, const CharT*>::value`.
+      !std::is_convertible<const T&, const CharT*>::value &&
+      !std::is_convertible<const T&, const basic_static_string&>::value`.
 
       @return The index corrosponding to the first occurrence of
       a character that is not in `{sv.begin(), sv.end())` within
@@ -5007,7 +5031,7 @@ public:
   */
   template<typename T
 #ifndef BOOST_STATIC_STRING_DOCS
-    , typename = detail::enable_if_viewable_t<T, CharT, Traits>
+    , typename = detail::enable_if_viewable_t<N, T, CharT, Traits>
 #endif
   >
   BOOST_STATIC_STRING_CPP14_CONSTEXPR
@@ -5140,7 +5164,8 @@ public:
       @par Constraints
 
       `std::is_convertible<const T&, string_view>::value &&
-      !std::is_convertible<const T&, const CharT*>::value`.
+      !std::is_convertible<const T&, const CharT*>::value &&
+      !std::is_convertible<const T&, const basic_static_string&>::value`.
 
       @return The index corrosponding to the last occurrence of
       a character that is not in `{sv.begin(), sv.end())` within
@@ -5152,7 +5177,7 @@ public:
   */
   template<typename T
 #ifndef BOOST_STATIC_STRING_DOCS
-    , typename = detail::enable_if_viewable_t<T, CharT, Traits>
+    , typename = detail::enable_if_viewable_t<N, T, CharT, Traits>
 #endif
   >
   BOOST_STATIC_STRING_CPP14_CONSTEXPR
@@ -5284,7 +5309,7 @@ public:
   */
   template<typename T
 #ifndef BOOST_STATIC_STRING_DOCS
-            , typename = detail::enable_if_viewable_t<T, CharT, Traits>
+            , typename = detail::enable_if_viewable_t<N, T, CharT, Traits>
 #endif
   >
   BOOST_STATIC_STRING_CPP14_CONSTEXPR
@@ -5348,7 +5373,7 @@ public:
   */
   template<typename T
 #ifndef BOOST_STATIC_STRING_DOCS
-            , typename = detail::enable_if_viewable_t<T, CharT, Traits>
+            , typename = detail::enable_if_viewable_t<N, T, CharT, Traits>
 #endif
   >
   BOOST_STATIC_STRING_CPP14_CONSTEXPR
@@ -5617,7 +5642,7 @@ operator==(
 
 template<std::size_t N, typename CharT, typename Traits, class T
 #ifndef BOOST_STATIC_STRING_DOCS
-      , typename = detail::enable_if_viewable_t<T, CharT, Traits>
+      , typename = detail::enable_if_viewable_t<N, T, CharT, Traits>
 #endif
     >
 BOOST_STATIC_STRING_CPP14_CONSTEXPR
@@ -5635,7 +5660,7 @@ operator==(
 
 template<std::size_t N, typename CharT, typename Traits, class T
 #ifndef BOOST_STATIC_STRING_DOCS
-      , typename = detail::enable_if_viewable_t<T, CharT, Traits>
+      , typename = detail::enable_if_viewable_t<N, T, CharT, Traits>
 #endif
     >
 BOOST_STATIC_STRING_CPP14_CONSTEXPR
@@ -5679,7 +5704,7 @@ operator!=(
 
 template<std::size_t N, typename CharT, typename Traits, class T
 #ifndef BOOST_STATIC_STRING_DOCS
-      , typename = detail::enable_if_viewable_t<T, CharT, Traits>
+      , typename = detail::enable_if_viewable_t<N, T, CharT, Traits>
 #endif
     >
 BOOST_STATIC_STRING_CPP14_CONSTEXPR
@@ -5697,7 +5722,7 @@ operator!=(
 
 template<std::size_t N, typename CharT, typename Traits, class T
 #ifndef BOOST_STATIC_STRING_DOCS
-      , typename = detail::enable_if_viewable_t<T, CharT, Traits>
+      , typename = detail::enable_if_viewable_t<N, T, CharT, Traits>
 #endif
     >
 BOOST_STATIC_STRING_CPP14_CONSTEXPR
@@ -5741,7 +5766,7 @@ operator<(
 
 template<std::size_t N, typename CharT, typename Traits, class T
 #ifndef BOOST_STATIC_STRING_DOCS
-      , typename = detail::enable_if_viewable_t<T, CharT, Traits>
+      , typename = detail::enable_if_viewable_t<N, T, CharT, Traits>
 #endif
     >
 BOOST_STATIC_STRING_CPP14_CONSTEXPR
@@ -5759,7 +5784,7 @@ operator<(
 
 template<std::size_t N, typename CharT, typename Traits, class T
 #ifndef BOOST_STATIC_STRING_DOCS
-      , typename = detail::enable_if_viewable_t<T, CharT, Traits>
+      , typename = detail::enable_if_viewable_t<N, T, CharT, Traits>
 #endif
     >
 BOOST_STATIC_STRING_CPP14_CONSTEXPR
@@ -5803,7 +5828,7 @@ operator<=(
 
 template<std::size_t N, typename CharT, typename Traits, class T
 #ifndef BOOST_STATIC_STRING_DOCS
-      , typename = detail::enable_if_viewable_t<T, CharT, Traits>
+      , typename = detail::enable_if_viewable_t<N, T, CharT, Traits>
 #endif
     >
 BOOST_STATIC_STRING_CPP14_CONSTEXPR
@@ -5821,7 +5846,7 @@ operator<=(
 
 template<std::size_t N, typename CharT, typename Traits, class T
 #ifndef BOOST_STATIC_STRING_DOCS
-      , typename = detail::enable_if_viewable_t<T, CharT, Traits>
+      , typename = detail::enable_if_viewable_t<N, T, CharT, Traits>
 #endif
     >
 BOOST_STATIC_STRING_CPP14_CONSTEXPR
@@ -5865,7 +5890,7 @@ operator>(
 
 template<std::size_t N, typename CharT, typename Traits, class T
 #ifndef BOOST_STATIC_STRING_DOCS
-      , typename = detail::enable_if_viewable_t<T, CharT, Traits>
+      , typename = detail::enable_if_viewable_t<N, T, CharT, Traits>
 #endif
     >
 BOOST_STATIC_STRING_CPP14_CONSTEXPR
@@ -5883,7 +5908,7 @@ operator>(
 
 template<std::size_t N, typename CharT, typename Traits, class T
 #ifndef BOOST_STATIC_STRING_DOCS
-      , typename = detail::enable_if_viewable_t<T, CharT, Traits>
+      , typename = detail::enable_if_viewable_t<N, T, CharT, Traits>
 #endif
     >
 BOOST_STATIC_STRING_CPP14_CONSTEXPR
@@ -5928,7 +5953,7 @@ operator>=(
 
 template<std::size_t N, typename CharT, typename Traits, class T
 #ifndef BOOST_STATIC_STRING_DOCS
-      , typename = detail::enable_if_viewable_t<T, CharT, Traits>
+      , typename = detail::enable_if_viewable_t<N, T, CharT, Traits>
 #endif
     >
 BOOST_STATIC_STRING_CPP14_CONSTEXPR
@@ -5946,7 +5971,7 @@ operator>=(
 
 template<std::size_t N, typename CharT, typename Traits, class T
 #ifndef BOOST_STATIC_STRING_DOCS
-      , typename = detail::enable_if_viewable_t<T, CharT, Traits>
+      , typename = detail::enable_if_viewable_t<N, T, CharT, Traits>
 #endif
     >
 BOOST_STATIC_STRING_CPP14_CONSTEXPR
diff --git a/test/static_string.cpp b/test/static_string.cpp
index c818975..4a6ee99 100644
--- a/test/static_string.cpp
+++ b/test/static_string.cpp
@@ -7393,6 +7393,15 @@ testOperatorPlus()
   }
 }
 
+// issue 47
+struct issue_47 : static_string<32>
+{
+    bool compare(const issue_47& other) const
+    {
+        return *this < other;
+    }
+};
+
 int
 runTests()
 {