diff --git a/clang/lib/Parse/ParseDeclCXX.cpp b/clang/lib/Parse/ParseDeclCXX.cpp
index a86f7ed..63e7179 100644
--- a/clang/lib/Parse/ParseDeclCXX.cpp
+++ b/clang/lib/Parse/ParseDeclCXX.cpp
@@ -3865,13 +3865,14 @@
     // Eat the left paren, then skip to the ending right paren.
     ConsumeParen();
     SkipUntil(tok::r_paren);
-    return false;
-  }
-
-  if (ScopeName && ScopeName->getName() == "gnu") {
-    // GNU-scoped attributes have some special cases to handle GNU-specific
-    // behaviors.
-    ParseGNUAttributeArgs(AttrName, AttrNameLoc, Attrs, EndLoc, ScopeName,
+    return false;
+  }
+
+  if (ScopeName &&
+      (ScopeName->getName() == "gnu" || ScopeName->getName() == "__gnu__")) {
+    // GNU-scoped attributes have some special cases to handle GNU-specific
+    // behaviors.
+    ParseGNUAttributeArgs(AttrName, AttrNameLoc, Attrs, EndLoc, ScopeName,
                           ScopeLoc, Syntax, nullptr);
     return true;
   }