diff --git a/core/test.go b/core/test.go
index 046cc53..2b9fbff 100644
--- a/core/test.go
+++ b/core/test.go
@@ -202,6 +202,12 @@ func initSys() {
 				return fmt.Sprint(s.GetUserID())
 			},
 		},
+		{
+			Rules: []string{"raw ^groupCode$"},
+			Handle: func(s Sender) interface{} {
+				return fmt.Sprint(s.GetChatID())
+			},
+		},
 		{
 			Rules: []string{"raw ^compiled_at$"},
 			Handle: func(s Sender) interface{} {