diff --git a/include/boost/static_assert.hpp b/include/boost/static_assert.hpp
index 8dfddae..ae547ad 100644
--- a/include/boost/static_assert.hpp
+++ b/include/boost/static_assert.hpp
@@ -67,7 +67,7 @@
 //
 // If the compiler warns about unused typedefs then enable this:
 //
-#if defined(__GNUC__) && (__GNUC__ >= 4)
+#if (defined(__GNUC__) && (__GNUC__ >= 4)) || defined(__clang__)
 #  define BOOST_STATIC_ASSERT_UNUSED_ATTRIBUTE __attribute__((unused))
 #else
 #  define BOOST_STATIC_ASSERT_UNUSED_ATTRIBUTE