diff --git a/mozilla/xpfe/appshell/src/nsAppShellFactory.cpp b/mozilla/xpfe/appshell/src/nsAppShellFactory.cpp
index d74c6c2fd57..e4b33cb4d8f 100644
--- a/mozilla/xpfe/appshell/src/nsAppShellFactory.cpp
+++ b/mozilla/xpfe/appshell/src/nsAppShellFactory.cpp
@@ -82,6 +82,11 @@ static nsModuleComponentInfo gAppShellModuleInfo[] =
     "@mozilla.org/appshell/commandLineService;1",
     nsCmdLineServiceConstructor,
   },
+  { "Window Mediator",
+    NS_WINDOWMEDIATOR_CID,
+    NS_WINDOWMEDIATOR_CONTRACTID,
+    nsWindowMediatorConstructor,
+  },
   { "Window Mediator",
     NS_WINDOWMEDIATOR_CID,
     NS_RDF_DATASOURCE_CONTRACTID_PREFIX "window-mediator",