diff --git a/.travis.yml b/.travis.yml
index 5e9d8ff..2a280e4 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -24,6 +24,8 @@ matrix:
         env: BJAM_TOOLSET=clang-std03
       - compiler: clang
         env: BJAM_TOOLSET=clang-std11
+      - compiler: clang
+        env: BJAM_TOOLSET=clang-pretend_no_auto_ptr_etc
 
 before_script:
     - |
@@ -31,6 +33,7 @@ before_script:
         echo "using gcc : std11 : g++-4.8 -Werror --std=c++11 ;" >> ~/user-config.jam
         echo "using clang : std03 : clang++ -Werror --std=c++03 ;" >> ~/user-config.jam
         echo "using clang : std11 : clang++ -Werror --std=c++11 ;" >> ~/user-config.jam
+        echo "using clang : pretend_no_auto_ptr_etc : clang++ -Werror --std=c++11 -D_HAS_AUTO_PTR_ETC=0 ;" >> ~/user-config.jam
     - cat ~/user-config.jam
     - touch Jamroot.jam
 
diff --git a/include/boost/functional/hash/extensions.hpp b/include/boost/functional/hash/extensions.hpp
index eafaefe..cb3c856 100644
--- a/include/boost/functional/hash/extensions.hpp
+++ b/include/boost/functional/hash/extensions.hpp
@@ -254,7 +254,7 @@ namespace boost
 #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
 
     template <class T> struct hash
-        : std::unary_function<T, std::size_t>
+        : boost::hash_detail::hash_base<T>
     {
 #if !defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING)
         std::size_t operator()(T const& val) const
@@ -271,7 +271,7 @@ namespace boost
 
 #if BOOST_WORKAROUND(__DMC__, <= 0x848)
     template <class T, unsigned int n> struct hash<T[n]>
-        : std::unary_function<T[n], std::size_t>
+        : boost::hash_detail::hash_base<T[n]>
     {
         std::size_t operator()(const T* val) const
         {
@@ -296,7 +296,7 @@ namespace boost
         {
             template <class T>
             struct inner
-                : std::unary_function<T, std::size_t>
+                : boost::hash_detail::hash_base<T>
             {
 #if !defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING)
                 std::size_t operator()(T const& val) const
diff --git a/include/boost/functional/hash/hash.hpp b/include/boost/functional/hash/hash.hpp
index 5bba408..76c4897 100644
--- a/include/boost/functional/hash/hash.hpp
+++ b/include/boost/functional/hash/hash.hpp
@@ -62,6 +62,18 @@ namespace boost
 {
     namespace hash_detail
     {
+#if defined(_HAS_AUTO_PTR_ETC) && !_HAS_AUTO_PTR_ETC
+        template <typename T>
+        struct hash_base
+        {
+            typedef T argument_type;
+            typedef std::size_t result_type;
+        };
+#else
+        template <typename T>
+        struct hash_base : std::unary_function<T, std::size_t> {};
+#endif
+
         struct enable_hash_value { typedef std::size_t type; };
 
         template <typename T> struct basic_numbers {};
@@ -419,7 +431,7 @@ namespace boost
 
 #define BOOST_HASH_SPECIALIZE(type) \
     template <> struct hash<type> \
-         : public std::unary_function<type, std::size_t> \
+         : public boost::hash_detail::hash_base<type> \
     { \
         std::size_t operator()(type v) const \
         { \
@@ -429,7 +441,7 @@ namespace boost
 
 #define BOOST_HASH_SPECIALIZE_REF(type) \
     template <> struct hash<type> \
-         : public std::unary_function<type, std::size_t> \
+         : public boost::hash_detail::hash_base<type> \
     { \
         std::size_t operator()(type const& v) const \
         { \
@@ -483,7 +495,7 @@ namespace boost
 
     template <class T>
     struct hash<T*>
-        : public std::unary_function<T*, std::size_t>
+        : public boost::hash_detail::hash_base<T*>
     {
         std::size_t operator()(T* v) const
         {
@@ -516,7 +528,7 @@ namespace boost
         {
             template <class T>
             struct inner
-                : public std::unary_function<T, std::size_t>
+                : public boost::hash_detail::hash_base<T>
             {
                 std::size_t operator()(T val) const
                 {
diff --git a/test/compile_time.hpp b/test/compile_time.hpp
index 40f39d8..db6bc59 100644
--- a/test/compile_time.hpp
+++ b/test/compile_time.hpp
@@ -10,7 +10,9 @@
 template <class T>
 void compile_time_tests(T*)
 {
+#if !defined(_HAS_AUTO_PTR_ETC) || _HAS_AUTO_PTR_ETC
     BOOST_STATIC_ASSERT((boost::is_base_and_derived<
         std::unary_function<T, std::size_t>, BOOST_HASH_TEST_NAMESPACE::hash<T> >::value));
+#endif
 }
 
diff --git a/test/hash_number_test.cpp b/test/hash_number_test.cpp
index 9adb5c6..ebfe4d4 100644
--- a/test/hash_number_test.cpp
+++ b/test/hash_number_test.cpp
@@ -127,9 +127,13 @@ void poor_quality_tests(T*)
         BOOST_TEST(x1(T(1)) !=  x2(T(-1)));
     if(T(1) != T(2))
         BOOST_TEST(x1(T(1)) !=  x2(T(2)));
-    if((limits::max)() != (limits::max)() - 1)
-        BOOST_TEST(x1(static_cast<T>((limits::max)()))
-            != x2(static_cast<T>((limits::max)() - 1)));
+
+    // TODO: This test is useless for floating point numbers.
+    T max_number = static_cast<T>((limits::max)());
+    T max_minus_one = static_cast<T>(max_number - 1);
+    if (max_number != max_minus_one) {
+        BOOST_TEST(x1(max_number) != x1(max_minus_one));
+    }
 }
 
 void bool_test()