--- a/dom/bluetooth/bluez/BluetoothHfpManager.cpp
+++ b/dom/bluetooth/bluez/BluetoothHfpManager.cpp
@@ -159,17 +159,17 @@ static CINDItem sCINDItems[] = {
   {"callheld", "0-2", CallHeldState::NO_CALLHELD, true},
   {"callsetup", "0-3", CallSetupState::NO_CALLSETUP, true},
   {"service", "0,1", 0, true},
   {"signal", "0-5", 0, true},
   {"roam", "0,1", 0, true}
 #endif
 };
 
-class BluetoothHfpManager::GetVolumeTask : public nsISettingsServiceCallback
+class BluetoothHfpManager::GetVolumeTask MOZ_FINAL : public nsISettingsServiceCallback
 {
 public:
   NS_DECL_ISUPPORTS
 
   NS_IMETHOD
   Handle(const nsAString& aName, JS::Handle<JS::Value> aResult)
   {
     MOZ_ASSERT(NS_IsMainThread());