diff --git a/lib/application.js b/lib/application.js
index b19055ec82..0cc711cf92 100644
--- a/lib/application.js
+++ b/lib/application.js
@@ -314,7 +314,7 @@ app.engine = function engine(ext, fn) {
  *
  * See the Router#param() docs for more details.
  *
- * @param {String|Array} name
+ * @param {(String|Array)} name
  * @param {Function} fn
  * @return {app} for chaining
  * @public
@@ -322,15 +322,11 @@ app.engine = function engine(ext, fn) {
 
 app.param = function param(name, fn) {
   if (Array.isArray(name)) {
-    for (var i = 0; i < name.length; i++) {
-      this.param(name[i], fn);
-    }
-
-    return this;
+    name.forEach((n) => this.param(n, fn));
+  } else {
+    this.router.param(name, fn);
   }
 
-  this.router.param(name, fn);
-
   return this;
 };