diff --git a/gispatcho.go b/gispatcho.go
index 4e96ed8..f598e71 100644
--- a/gispatcho.go
+++ b/gispatcho.go
@@ -26,8 +26,10 @@ type URLs struct {
 	Prefix string
 }
 
+type Repl map[string]string
+
 // Given a name and replacements, return a rendered path component of a URL
-func (urls URLs) Reverse(name string, replacements map[string]string) string {
+func (urls URLs) Reverse(name string, replacements Repl) string {
 	pattern := urls.URLs[name].Path
 
 	for key, val := range replacements {