diff --git a/include/boost/mp11/detail/config.hpp b/include/boost/mp11/detail/config.hpp
index eab5404..1c4b1ed 100644
--- a/include/boost/mp11/detail/config.hpp
+++ b/include/boost/mp11/detail/config.hpp
@@ -125,7 +125,7 @@
 
 #if BOOST_MP11_WORKAROUND( BOOST_MP11_MSVC, < 1900 )
 #  define BOOST_MP11_DEPRECATED(msg)
-#elif BOOST_MP11_WORKAROUND( BOOST_MP11_GCC, < 50000 )
+#elif BOOST_MP11_WORKAROUND( BOOST_MP11_GCC, < 50000 ) || BOOST_MP11_WORKAROUND( BOOST_MP11_CLANG, < 309 )
 #  define BOOST_MP11_DEPRECATED(msg) __attribute__((deprecated(msg)))
 #else
 #  define BOOST_MP11_DEPRECATED(msg) [[deprecated(msg)]]