diff --git a/server/modules/protocol/mysql_client.c b/server/modules/protocol/mysql_client.c
index 70ddcac84..71979000a 100644
--- a/server/modules/protocol/mysql_client.c
+++ b/server/modules/protocol/mysql_client.c
@@ -594,7 +594,7 @@ static int gw_mysql_do_authentication(DCB *dcb, GWBUF **buf) {
 		else
 		{
 			LOGIF(LM, (skygw_log_write(LOGFILE_MESSAGE,
-				"%s: login attempt for user %s, user not "
+				"%s: login attempt for user '%s', user not "
 				"found.",
 				dcb->service->name, username)));
 		}