diff --git a/layout/style/nsComputedDOMStyle.h b/layout/style/nsComputedDOMStyle.h
index dbe63acce..72b67cd56 100644
--- a/layout/style/nsComputedDOMStyle.h
+++ b/layout/style/nsComputedDOMStyle.h
@@ -75,7 +75,7 @@ public:
 
   nsINode *GetParentObject() override
   {
-    return mElement;
+    return reinterpret_cast<nsINode*>(mElement.get());
   }
 
   static already_AddRefed<nsStyleContext>