diff --git a/clang/test/Parser/attr-availability.c b/clang/test/Parser/attr-availability.c
--- a/clang/test/Parser/attr-availability.c
+++ b/clang/test/Parser/attr-availability.c
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -fsyntax-only -verify %s
+// RUN: %clang_cc1 -std=c11 -fsyntax-only -verify %s
 
 #if !__has_feature(attribute_availability)
 #  error 'availability' attribute is not available