diff --git a/core.go b/core.go
index d3b638d2b..01cbeb2a2 100755
--- a/core.go
+++ b/core.go
@@ -16,7 +16,7 @@ import (
 	"v2ray.com/core/common/serial"
 )
 
-var (
+const (
 	version  = "3.47"
 	build    = "Custom"
 	codename = "die Commanderin"