diff --git a/dom/base/nsDOMClassInfo.cpp b/dom/base/nsDOMClassInfo.cpp
index 528488ee2293..0ecbf73e613d 100644
--- a/dom/base/nsDOMClassInfo.cpp
+++ b/dom/base/nsDOMClassInfo.cpp
@@ -6128,6 +6128,7 @@ nsWindowSH::NewResolve(nsIXPConnectWrappedNative *wrapper, JSContext *cx,
     JS::Value exn = JSVAL_VOID;
 
     {
+      nsCxPusher pusher;
       Maybe<JSAutoCompartment> ac;
 
       JSContext* my_cx;
@@ -6137,6 +6138,7 @@ nsWindowSH::NewResolve(nsIXPConnectWrappedNative *wrapper, JSContext *cx,
         my_cx = my_context->GetNativeContext();
 
         if (my_cx != cx) {
+          pusher.Push(my_cx);
           ac.construct(my_cx, obj);
         }
       }