--- a/netwerk/base/nsProtocolProxyService.cpp
+++ b/netwerk/base/nsProtocolProxyService.cpp
@@ -1130,16 +1130,17 @@ nsProtocolProxyService::ReloadPAC()
 // a false mainThreadResponse parameter.
 class nsAsyncBridgeRequest final  : public nsPACManCallback
 {
     NS_DECL_THREADSAFE_ISUPPORTS
 
      nsAsyncBridgeRequest()
         : mMutex("nsDeprecatedCallback")
         , mCondVar(mMutex, "nsDeprecatedCallback")
+        , mStatus(NS_OK)
         , mCompleted(false)
     {
     }
 
     void OnQueryComplete(nsresult status,
                          const nsCString &pacString,
                          const nsCString &newPACURL) override
     {