diff --git a/tests/test_common_callbacks.cpp b/tests/test_common_callbacks.cpp
index ccae78e0..f9ab4423 100644
--- a/tests/test_common_callbacks.cpp
+++ b/tests/test_common_callbacks.cpp
@@ -73,6 +73,7 @@ struct TestLoggingSpinnerCallbacks : public TestSpinnerCallbacks, public WithPar
         default:
             assert(false && "shouldn't be here");
         }
+        __builtin_unreachable();
     }
 };