diff --git a/contrib/libc++/include/__config b/contrib/libc++/include/__config
index a8c3498b0a3..ccf7f756b1c 100644
--- a/contrib/libc++/include/__config
+++ b/contrib/libc++/include/__config
@@ -374,6 +374,7 @@ namespace std {
 #define _LIBCPP_HAS_NO_VARIADICS
 #define _LIBCPP_HAS_NO_RVALUE_REFERENCES
 #define _LIBCPP_HAS_NO_ALWAYS_INLINE_VARIADICS
+#define _LIBCPP_HAS_NO_STRONG_ENUMS
 
 #else  // __GXX_EXPERIMENTAL_CXX0X__