diff --git a/partnerapi/tnc/const.go b/partnerapi/tnc/const.go
index d07f2f1..1c8b307 100644
--- a/partnerapi/tnc/const.go
+++ b/partnerapi/tnc/const.go
@@ -15,7 +15,7 @@ const (
 
 	TPLCodeGHN          = "GHN"
 	TPLCodeGHTK         = "GHTK"
-	TPLCodeBest         = "BEST"
+	TPLCodeBest         = "BEX"
 	TPLCodeSnappy       = "SPY"
 	TPLCodeViettelPost  = "VTP"
 	TPLCodeSellyExpress = "SE"