diff --git a/lib/querystring.js b/lib/querystring.js
index f0d473a39ae24d..09220a919e3edc 100644
--- a/lib/querystring.js
+++ b/lib/querystring.js
@@ -147,8 +147,10 @@ QueryString.escape = function(str) {
 };
 
 var stringifyPrimitive = function(v) {
-  if (typeof v === 'string' || (typeof v === 'number' && isFinite(v)))
+  if (typeof v === 'string')
     return v;
+  if (typeof v === 'number' && isFinite(v))
+    return '' + v;
   if (typeof v === 'boolean')
     return v ? 'true' : 'false';
   return '';