diff --git a/src/debug.c b/src/debug.c
index cd3a22a928c16fd7c691c46c6585861522145c07..2f62bedb055d75a7d982fc4e10a6f35ab30eef2c 100644
--- a/src/debug.c
+++ b/src/debug.c
@@ -338,7 +338,7 @@ void debugCommand(redisClient *c) {
         server.active_expire_enabled = atoi(c->argv[2]->ptr);
         addReply(c,shared.ok);
     } else {
-        addReplyErrorFormat(c, "Unknown DEBUG subcommand '%s'",
+        addReplyErrorFormat(c, "Unknown DEBUG subcommand or wrong number of arguments for '%s'",
             (char*)c->argv[1]->ptr);
     }
 }