diff --git a/router.go b/router.go
index d9bd8cc..3dbacbb 100644
--- a/router.go
+++ b/router.go
@@ -20,6 +20,11 @@ func NewRouter() *Router {
 	return r
 }
 
+// DO NOT USE it for routing, exposed only for edge cases.
+func (r *Router) ServeMux() *http.ServeMux {
+	return r.mux
+}
+
 // Use will register middleware(s) with router stack
 func (r *Router) Use(h ...func(http.Handler) http.Handler) {
 	if r == nil {