diff --git a/lib/parse.js b/lib/parse.js
index 317bc6b2..fae28d69 100755
--- a/lib/parse.js
+++ b/lib/parse.js
@@ -33,7 +33,7 @@ var parseValues = function parseQueryStringValues(str, options) {
             val = options.decoder(part.slice(pos + 1));
         }
         if (has.call(obj, key)) {
-            obj[key] = [].concat(obj[key]).concat(val);
+            obj[key] = utils.combine(obj[key], val);
         } else {
             obj[key] = val;
         }
diff --git a/lib/utils.js b/lib/utils.js
index 0d410c6a..956c229b 100755
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -178,3 +178,7 @@ exports.isBuffer = function (obj) {
 
     return !!(obj.constructor && obj.constructor.isBuffer && obj.constructor.isBuffer(obj));
 };
+
+exports.combine = function (a, b) {
+    return [].concat(a).concat(b);
+};