diff --git a/include/boost/static_string/config.hpp b/include/boost/static_string/config.hpp
index 7789e34..ba0044c 100644
--- a/include/boost/static_string/config.hpp
+++ b/include/boost/static_string/config.hpp
@@ -25,6 +25,16 @@
 #define BOOST_STATIC_STRING_USE_DEDUCT
 #endif
 
+// Include <version> if we can
+#if __has_include(<version>)
+#include <version>
+#endif
+
+// Can we use is_constant_evaluated?
+#if __cpp_lib_is_constant_evaluated >= 201811L
+#define BOOST_STATIC_STRING_USE_IS_CONST_EVAL
+#endif
+
 // Can we use [[nodiscard]]?
 #ifdef __has_attribute
 #if __has_attribute(nodiscard)
diff --git a/include/boost/static_string/impl/static_string.hpp b/include/boost/static_string/impl/static_string.hpp
index dddd924..155fee3 100644
--- a/include/boost/static_string/impl/static_string.hpp
+++ b/include/boost/static_string/impl/static_string.hpp
@@ -363,7 +363,15 @@ insert(
   const auto s = &*first;
   BOOST_STATIC_STRING_THROW_IF(
     count > max_size() - curr_size, std::length_error{"count > max_size() - size()"});
-  const bool inside = s <= &curr_data[curr_size] && s >= curr_data;
+  // Makes this more constexpr friendly if we can use is_constant_evaluated
+  const bool inside =
+#ifdef BOOST_STATIC_STRING_USE_IS_CONST_EVAL
+    std::is_constant_evaluated() ?
+    detail::is_inside(curr_data, curr_data + curr_size, s) :
+    s <= &curr_data[curr_size] && s >= curr_data;
+#else
+    s <= &curr_data[curr_size] && s >= curr_data;
+#endif
   if (!inside || (inside && ((s - curr_data) + count <= index)))
   {
     Traits::move(&curr_data[index + count], &curr_data[index], curr_size - index + 1);
@@ -683,7 +691,15 @@ replace(
     curr_size - (std::min)(n1, curr_size - pos) >= max_size() - n2,
     std::length_error{"replaced string exceeds max_size()"});
   n1 = (std::min)(n1, curr_size - pos);
-  const bool inside = s <= &curr_data[curr_size] && s >= curr_data;
+  // Makes this more constexpr friendly if we can use is_constant_evaluated
+  const bool inside =
+#ifdef BOOST_STATIC_STRING_USE_IS_CONST_EVAL
+    std::is_constant_evaluated() ? 
+    detail::is_inside(curr_data, curr_data + curr_size, s) :
+    s <= &curr_data[curr_size] && s >= curr_data;
+#else
+    s <= &curr_data[curr_size] && s >= curr_data;
+#endif
   if (inside && size_type(s - curr_data) == pos && n1 == n2)
     return *this;
   if (!inside || (inside && ((s - curr_data) + n2 <= pos)))
diff --git a/test/constexpr_tests.hpp b/test/constexpr_tests.hpp
index 1df0ba9..77a7acf 100644
--- a/test/constexpr_tests.hpp
+++ b/test/constexpr_tests.hpp
@@ -191,6 +191,11 @@ testConstantEvaluation()
   a.replace(a.begin(), a.end(), a.begin(), a.end());
   a.replace(a.begin(), a.end(), {'a'});
 
+#ifdef BOOST_STATIC_STRING_USE_IS_CONST_EVAL
+  a.replace(a.begin(), a.end(), "a");
+  a.replace(a.begin(), a.end(), "a", 1);
+#endif
+
   // find
   a.find(a);
   a.find("a", 0, 1);