diff --git a/tests/system-test/2-query/To_iso8601.py b/tests/system-test/2-query/To_iso8601.py
index f00d25bd2189611d979b1316e1fa1ec9934ca718..b9cf1ce9a74ceda35019bfec894fd7ee046ee0b1 100644
--- a/tests/system-test/2-query/To_iso8601.py
+++ b/tests/system-test/2-query/To_iso8601.py
@@ -35,7 +35,7 @@ class TDTestCase:
                             '+00:00','+01:00','+02:00','+03:00','+03:30','+04:00','+05:00','+05:30','+06:00','+07:00','+08:00','+09:00','+10:00','+11:00','+12:00',\
                             '-0000','-0100','-0200','-0300','-0400','-0500','-0600','-0700','-0800','-0900','-1000','-1100','-1200',\
                         '-00','-01','-02','-03','-04','-05','-06','-07','-08','-09','-10','-11','-12',\
-                            '-00:00','-01:00','-02:00','-03:00','-04:00','-05:00','-06:00','-07:00','-08:00','-09:00','-10:00','-11:00','-12:00'\
+                            '-00:00','-01:00','-02:00','-03:00','-04:00','-05:00','-06:00','-07:00','-08:00','-09:00','-10:00','-11:00','-12:00',\
                                 'z','Z']
         for j in timezone_list:
             tdSql.query(f'select to_iso8601(ts,"{j}") from ntb')