diff --git a/js/src/xpconnect/loader/mozJSComponentLoader.cpp b/js/src/xpconnect/loader/mozJSComponentLoader.cpp
index 1d6b7d9e0998..ed2a7199180a 100644
--- a/js/src/xpconnect/loader/mozJSComponentLoader.cpp
+++ b/js/src/xpconnect/loader/mozJSComponentLoader.cpp
@@ -1219,6 +1219,10 @@ mozJSComponentLoader::GlobalForLocation(nsILocalFile *aComponentFile,
     rv = holder->GetJSObject(&global);
     NS_ENSURE_SUCCESS(rv, rv);
 
+    JSAutoCrossCompartmentCall ac;
+    if (!ac.enter(cx, global))
+        return NS_ERROR_FAILURE;
+
     if (!JS_DefineFunctions(cx, global, gGlobalFun)) {
         return NS_ERROR_FAILURE;
     }