diff --git a/clang/include/clang/Basic/DiagnosticGroups.td b/clang/include/clang/Basic/DiagnosticGroups.td
index a8a5e5914eae..b79bf8e2edbe 100644
--- a/clang/include/clang/Basic/DiagnosticGroups.td
+++ b/clang/include/clang/Basic/DiagnosticGroups.td
@@ -195,4 +195,4 @@ def NonGCC : DiagGroup<"non-gcc",
     [SignCompare, Conversion, LiteralRange]>;
 
 // A warning group for warnings about GCC extensions.
-def GNU : DiagGroup<"gnu", [GNUDesignator]>;
+def GNU : DiagGroup<"gnu", [GNUDesignator, VLA]>;