diff --git a/include/boost/config/compiler/clang.hpp b/include/boost/config/compiler/clang.hpp
index 18d6e546..209c9007 100644
--- a/include/boost/config/compiler/clang.hpp
+++ b/include/boost/config/compiler/clang.hpp
@@ -20,7 +20,7 @@
 #  define BOOST_NO_TYPEID
 #endif
 
-#if defined(__int64)
+#if defined(__int64) && !defined(__GNUC__)
 #  define BOOST_HAS_MS_INT64
 #endif