diff --git a/netwerk/protocol/http/HttpChannelParent.h b/netwerk/protocol/http/HttpChannelParent.h
index 51fae5a82a..a3b377d490 100644
--- a/netwerk/protocol/http/HttpChannelParent.h
+++ b/netwerk/protocol/http/HttpChannelParent.h
@@ -209,7 +209,7 @@ private:
   RefPtr<nsHttpChannel>       mChannel;
   nsCOMPtr<nsICacheEntry>       mCacheEntry;
   nsCOMPtr<nsIAssociatedContentSecurity>  mAssociatedContentSecurity;
-  bool mIPCClosed;                // PHttpChannel actor has been Closed()
+  Atomic<bool> mIPCClosed; // PHttpChannel actor has been Closed()
 
   nsCOMPtr<nsIChannel> mRedirectChannel;
   nsCOMPtr<nsIAsyncVerifyRedirectCallback> mRedirectCallback;