diff --git a/lib/utils.js b/lib/utils.js
index 6cde738d13..f6aa4ef0e6 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -37,10 +37,9 @@ exports.promisifyRouteParams = function (fn) {
   if (Array.isArray(fn)) {
     return Promise.resolve(fn)
   }
-  let promise
   // If routeParams[route] is a function expecting a callback
   if (fn.length === 1) {
-    promise = new Promise((resolve, reject) => {
+    return new Promise((resolve, reject) => {
       fn(function (err, routeParams) {
         if (err) {
           reject(err)
@@ -48,9 +47,8 @@ exports.promisifyRouteParams = function (fn) {
         resolve(routeParams)
       })
     })
-  } else {
-    promise = fn()
   }
+  let promise = fn()
   if (!(promise instanceof Promise)) {
     promise = Promise.resolve(promise)
   }