diff --git a/index.js b/index.js
index 590491e..da362f8 100644
--- a/index.js
+++ b/index.js
@@ -77,6 +77,7 @@ function createObject() {
  */
 
 var isint = /^[0-9]+$/;
+var isnumstr = /^['"][0-9]+['"]$/;
 
 function promote(parent, key) {
   if (parent[key].length == 0) return parent[key] = createObject();
@@ -92,6 +93,9 @@ function promote(parent, key) {
 
 function parse(parts, parent, key, val) {
   var part = parts.shift();
+
+  key = isnumstr.test(key) ? key.replace(/['"]/g, '') : key;
+
   // end
   if (!part) {
     if (isArray(parent[key])) {
@@ -311,15 +315,18 @@ function stringifyArray(arr, prefix) {
 function stringifyObject(obj, prefix) {
   var ret = []
     , keys = objectKeys(obj)
-    , key;
+    , key, val;
 
   for (var i = 0, len = keys.length; i < len; ++i) {
     key = keys[i];
+    val = obj[key];
+
     if ('' == key) continue;
-    if (null == obj[key]) {
+    if (null == val) {
       ret.push(encodeURIComponent(key) + '=');
     } else {
-      ret.push(stringify(obj[key], prefix
+      key = isint.test(key) ? "'" + key + "'" : key;
+      ret.push(stringify(val, prefix
         ? prefix + '[' + encodeURIComponent(key) + ']'
         : encodeURIComponent(key)));
     }
@@ -340,6 +347,7 @@ function stringifyObject(obj, prefix) {
  */
 
 function set(obj, key, val) {
+  key = isnumstr.test(key) ? key.replace(/['"]/g, '') : key;
   var v = obj[key];
   if (undefined === v) {
     obj[key] = val;
diff --git a/test/parse.js b/test/parse.js
index a06dcd8..32ed1a3 100644
--- a/test/parse.js
+++ b/test/parse.js
@@ -160,6 +160,13 @@ describe('qs.parse()', function(){
     expect(q).to.eql({ a: ['2', '1'] });
   })
 
+  it('should support objects with numbers as keys', function(){
+    expect(qs.parse("a['111']=1")).to.eql({ a: { '111': '1' }});
+    expect(qs.parse("'123'=hello")).to.eql({ '123': 'hello' });
+    expect(qs.parse("a['111'][b]=222")).to.eql({ a: { '111': { b: '222' }}});
+    expect(qs.parse('a["111"][b]=222')).to.eql({ a: { '111': { b: '222' }}});
+  })
+
   if ('undefined' == typeof window) {
     it('should not be possible to access Object prototype', function() {
       qs.parse('constructor[prototype][bad]=bad');
diff --git a/test/stringify.js b/test/stringify.js
index 0d52250..17dce7d 100644
--- a/test/stringify.js
+++ b/test/stringify.js
@@ -54,7 +54,9 @@ var str_identities = {
   ],
   'numbers': [
     { str: 'limit[0]=1&limit[1]=2&limit[2]=3', obj: { limit: [1, 2, '3'] }},
-    { str: 'limit=1', obj: { limit: 1 }}
+    { str: 'limit=1', obj: { limit: 1 }},
+    { str: "a['111']=1", obj: { a: { '111': 1 } } },
+    { str: "'123'=hello", obj: { '123': "hello" } }
   ],
   'others': [
     { str: 'at=' + encodeURIComponent(date), obj: { at: date } }