diff --git a/hash/examples/point.cpp b/hash/examples/point.cpp
index 6943342..f3d30e1 100644
--- a/hash/examples/point.cpp
+++ b/hash/examples/point.cpp
@@ -3,6 +3,11 @@
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
+// Force use of assert.
+#if defined(NDEBUG)
+#undef NDEBUG
+#endif
+
 #include <boost/functional/hash.hpp>
 #include <cassert>
 
diff --git a/hash/examples/portable.cpp b/hash/examples/portable.cpp
index 88f2fc7..511133e 100644
--- a/hash/examples/portable.cpp
+++ b/hash/examples/portable.cpp
@@ -3,6 +3,11 @@
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
+// Force use of assert.
+#if defined(NDEBUG)
+#undef NDEBUG
+#endif
+
 #include <boost/functional/hash.hpp>
 #include <cassert>
 
diff --git a/hash/test/hash_number_test.cpp b/hash/test/hash_number_test.cpp
index 242c731..9adb5c6 100644
--- a/hash/test/hash_number_test.cpp
+++ b/hash/test/hash_number_test.cpp
@@ -58,8 +58,6 @@ void numeric_extra_tests(typename
 template <class T>
 void numeric_test(T*)
 {
-    typedef boost::hash_detail::limits<T> limits;
-
     compile_time_tests((T*) 0);
 
     BOOST_HASH_TEST_NAMESPACE::hash<T> x1;