--- a/gfx/layers/ipc/RemoteContentController.cpp
+++ b/gfx/layers/ipc/RemoteContentController.cpp
@@ -208,14 +208,15 @@ RemoteContentController::ActorDestroy(Ac
   // by a RefPtr, but it is no longer valid to send messages.
   mCanSend = false;
 }
 
 void
 RemoteContentController::Destroy()
 {
   if (mCanSend) {
+    mCanSend = false;
     Unused << SendDestroy();
   }
 }
 
 } // namespace layers
 } // namespace mozilla