diff --git a/tests/modules/postnotifications.c b/tests/modules/postnotifications.c
index b4a97cbd5c..f5878c8f03 100644
--- a/tests/modules/postnotifications.c
+++ b/tests/modules/postnotifications.c
@@ -213,7 +213,7 @@ static void KeySpace_ServerEventCallback(RedisModuleCtx *ctx, RedisModuleEvent e
     REDISMODULE_NOT_USED(eid);
     REDISMODULE_NOT_USED(data);
     if (subevent > 3) {
-        RedisModule_Log(ctx, "warning", "Got an unexpected subevent '%ld'", subevent);
+        RedisModule_Log(ctx, "warning", "Got an unexpected subevent '%llu'", subevent);
         return;
     }
     static const char* events[] = {