--- a/dom/canvas/OffscreenCanvas.h
+++ b/dom/canvas/OffscreenCanvas.h
@@ -155,16 +155,17 @@ public:
   virtual already_AddRefed<nsISupports>
   GetContext(JSContext* aCx,
              const nsAString& aContextId,
              JS::Handle<JS::Value> aContextOptions,
              ErrorResult& aRv) override;
 
   void SetNeutered()
   {
+    ClearResources();
     mNeutered = true;
   }
 
   bool IsNeutered() const
   {
     return mNeutered;
   }