diff --git a/mozilla/dom/src/base/nsDOMClassInfo.cpp b/mozilla/dom/src/base/nsDOMClassInfo.cpp
index af500db3881..0acc43c08d8 100644
--- a/mozilla/dom/src/base/nsDOMClassInfo.cpp
+++ b/mozilla/dom/src/base/nsDOMClassInfo.cpp
@@ -9605,4 +9605,5 @@ nsNonDOMObjectSH::GetFlags(PRUint32 *aFlags)
   // to do something like implement nsISecurityCheckedComponent in a meaningful
   // way.
   *aFlags = nsIClassInfo::MAIN_THREAD_ONLY;
+  return NS_OK;
 }