diff --git a/src/util/macros.h b/src/util/macros.h
index 5fc6729536c..eec8b9352cc 100644
--- a/src/util/macros.h
+++ b/src/util/macros.h
@@ -82,7 +82,7 @@ do {                        \
 #endif
 
 #ifndef unreachable
-#define unreachable(str)
+#define unreachable(str) assert(!str)
 #endif
 
 /**