diff --git a/features/lorawan/lorastack/mac/LoRaMac.h b/features/lorawan/lorastack/mac/LoRaMac.h
index 783175a284..9f1837e283 100644
--- a/features/lorawan/lorastack/mac/LoRaMac.h
+++ b/features/lorawan/lorastack/mac/LoRaMac.h
@@ -475,11 +475,13 @@ public:
     {
         osStatus status = _mutex.lock();
         MBED_ASSERT(status == osOK);
+        (void) status;
     }
     void unlock(void)
     {
         osStatus status = _mutex.unlock();
         MBED_ASSERT(status == osOK);
+        (void) status;
     }
 #else
     void lock(void) { }