diff --git a/register/register.go b/register/register.go
index ed27f0a0..4b74b547 100644
--- a/register/register.go
+++ b/register/register.go
@@ -11,10 +11,11 @@ import (
 const (
 	// WildcardDomain indicates any domain
 	WildcardDomain = "*"
-	// DefaultDomain to use if none was provided in options
-	DefaultDomain = "micro"
 )
 
+// DefaultDomain to use if none was provided in options
+var DefaultDomain = "micro"
+
 var (
 	// DefaultRegister is the global default register
 	DefaultRegister Register = NewRegister()