diff --git a/lib/Sema/Sema.h b/lib/Sema/Sema.h
index 85fa4f1..ba6d38f 100644
--- a/lib/Sema/Sema.h
+++ b/lib/Sema/Sema.h
@@ -728,6 +728,7 @@
       const PartialDiagnostic &DiagID, const PartialDiagnostic & NoteID,
       const FunctionProtoType *Old, SourceLocation OldLoc,
       const FunctionProtoType *New, SourceLocation NewLoc,
+      bool *MissingExceptionSpecification = 0,
       bool *MissingEmptyExceptionSpecification = 0);
   bool CheckExceptionSpecSubset(
       const PartialDiagnostic &DiagID, const PartialDiagnostic & NoteID,