diff --git a/dom/bluetooth/bluez/BluetoothDBusService.cpp b/dom/bluetooth/bluez/BluetoothDBusService.cpp
index 410b378c4c7c..44680cba3926 100644
--- a/dom/bluetooth/bluez/BluetoothDBusService.cpp
+++ b/dom/bluetooth/bluez/BluetoothDBusService.cpp
@@ -1111,7 +1111,7 @@ public:
         break;
       }
     }
-    MOZ_ASSERT_IF(i == properties.Length(), "failed to get device name");
+    MOZ_ASSERT(i != properties.Length(), "failed to get device name");
 
     nsRefPtr<DistributeBluetoothSignalTask> task =
       new DistributeBluetoothSignalTask(mSignal);