diff --git a/core/test.go b/core/test.go
index 2b9fbff..e2a34be 100644
--- a/core/test.go
+++ b/core/test.go
@@ -205,7 +205,7 @@ func initSys() {
 		{
 			Rules: []string{"raw ^groupCode$"},
 			Handle: func(s Sender) interface{} {
-				return fmt.Sprint(s.GetChatID())
+				return fmt.Sprintf("%d", s.GetChatID())
 			},
 		},
 		{