diff --git a/lib/Parse/ParseExpr.cpp b/lib/Parse/ParseExpr.cpp
index 20c55a1..55fc0cd 100644
--- a/lib/Parse/ParseExpr.cpp
+++ b/lib/Parse/ParseExpr.cpp
@@ -225,8 +225,14 @@
 /// process of disambiguating between an expression and a declaration.
 Parser::OwningExprResult
 Parser::ParseExpressionWithLeadingExtension(SourceLocation ExtLoc) {
-  OwningExprResult LHS(ParseCastExpression(false));
-  if (LHS.isInvalid()) return move(LHS);
+  OwningExprResult LHS(Actions, true);
+  {
+    // Silence extension warnings in the sub-expression
+    ExtensionRAIIObject O(Diags);
+
+    LHS = ParseCastExpression(false);
+    if (LHS.isInvalid()) return move(LHS);
+  }
 
   LHS = Actions.ActOnUnaryOp(CurScope, ExtLoc, tok::kw___extension__,
                              move(LHS));
diff --git a/lib/Parse/ParseStmt.cpp b/lib/Parse/ParseStmt.cpp
index d0d462b..50db966 100644
--- a/lib/Parse/ParseStmt.cpp
+++ b/lib/Parse/ParseStmt.cpp
@@ -435,13 +435,13 @@
       SourceLocation ExtLoc = ConsumeToken();
       while (Tok.is(tok::kw___extension__))
         ConsumeToken();
-      
-      // __extension__ silences extension warnings in the subexpression.
-      ExtensionRAIIObject O(Diags);  // Use RAII to do this.
 
       // If this is the start of a declaration, parse it as such.
       if (isDeclarationStatement()) {
+        // __extension__ silences extension warnings in the subdeclaration.
         // FIXME: Save the __extension__ on the decl as a node somehow?
+        ExtensionRAIIObject O(Diags);
+
         SourceLocation DeclStart = Tok.getLocation(), DeclEnd;
         DeclGroupPtrTy Res = ParseDeclaration(Declarator::BlockContext,DeclEnd);
         R = Actions.ActOnDeclStmt(Res, DeclStart, DeclEnd);