diff --git a/unipay/providers/transfer.py b/unipay/providers/transfer.py
index 1ab43fe..70a5aa8 100644
--- a/unipay/providers/transfer.py
+++ b/unipay/providers/transfer.py
@@ -75,7 +75,7 @@ class TransferGateway(Gateway):
 	async def new_tcode(self, sor):
 		tcode = self.gen_mailcode()
 		sql = "select * from transfercode where tcode=${tcode}$ and status='0'"
-		while True
+		while True:
 			recs = await sor.sqlExe(sql, {'tcode': tcode})
 			if len(recs) == 0:
 				break