diff --git a/server/modules/monitor/mysql_mon.c b/server/modules/monitor/mysql_mon.c
index 2fdc6a97e..38625a6ed 100644
--- a/server/modules/monitor/mysql_mon.c
+++ b/server/modules/monitor/mysql_mon.c
@@ -548,7 +548,7 @@ static int        conn_err_count;
 			}
 			mysql_free_result(result);
 
-			if (isslave == i)
+			if (isslave > 0 && isslave == i)
 				isslave = 1;
 			else
 				isslave = 0;
@@ -797,4 +797,4 @@ static bool mon_print_fail_status(
                 succp = false;
         }
         return succp;
-}
\ No newline at end of file
+}