diff --git a/types/utils.go b/types/utils.go
index 63fd2ac2..0ed273a4 100644
--- a/types/utils.go
+++ b/types/utils.go
@@ -25,7 +25,7 @@ import (
 const (
 	begin = "("
 	end   = ")"
-	sep   = "/"
+	sep   = "-"
 )
 
 type Stringable interface {