diff --git a/dom/bluetooth/BluetoothOppManager.cpp b/dom/bluetooth/BluetoothOppManager.cpp
index a14eff95357b..9b535da414ad 100644
--- a/dom/bluetooth/BluetoothOppManager.cpp
+++ b/dom/bluetooth/BluetoothOppManager.cpp
@@ -467,6 +467,7 @@ BluetoothOppManager::AfterOppDisconnected()
   mConnected = false;
   mLastCommand = 0;
   mBlob = nullptr;
+  mPacketLeftLength = 0;
 
   // We can't reset mSuccessFlag here since this function may be called
   // before we send system message of transfer complete