diff --git a/lib/child_process.js b/lib/child_process.js
index b881150f29..3996c954c1 100644
--- a/lib/child_process.js
+++ b/lib/child_process.js
@@ -10,24 +10,26 @@ var spawn = exports.spawn = function (path, args, env, customFds) {
   return child;
 };
 
-exports.exec = function (command /*, options, callback */) {
+exports.exec = function (command /*, options, callback, env */) {
   if (arguments.length < 3) {
     return exports.execFile("/bin/sh", ["-c", command], arguments[1]);
-  } else {
+  } else if (arguments.length < 4) {
     return exports.execFile("/bin/sh", ["-c", command], arguments[1], arguments[2]);
+  } else {
+    return exports.execFile("/bin/sh", ["-c", command], arguments[1], arguments[2], arguments[3]);
   }
 };
 
-exports.execFile = function (file, args /*, options, callback */) {
+exports.execFile = function (file, args /*, options, callback, env */) {
   var options = { encoding: 'utf8'
                 , timeout: 0
                 , maxBuffer: 200*1024
                 , killSignal: 'SIGKILL'
                 };
 
-  var callback = arguments[arguments.length-1];
-
-  if (typeof arguments[2] == 'object') {
+  var callback = (arguments.length == 5 ? arguments[3] : arguments[arguments.length-1]);
+  
+  if (arguments[2] && typeof arguments[2] == 'object') {
     var keys = Object.keys(options);
     for (var i = 0; i < keys.length; i++) {
       var k = keys[i];
@@ -35,7 +37,7 @@ exports.execFile = function (file, args /*, options, callback */) {
     }
   }
 
-  var child = spawn(file, args);
+  var child = arguments[4] ? spawn(file, args, arguments[4]) : spawn(file, args);
   var stdout = "";
   var stderr = "";
   var killed = false;
diff --git a/test/simple/test-child-process-exec-env.js b/test/simple/test-child-process-exec-env.js
new file mode 100644
index 0000000000..58d6d90148
--- /dev/null
+++ b/test/simple/test-child-process-exec-env.js
@@ -0,0 +1,31 @@
+require('../common');
+var exec = require('child_process').exec,
+    sys = require('sys');
+success_count = 0;
+error_count = 0;
+response = "";
+
+child = exec('/usr/bin/env', [], function (err, stdout, stderr) {
+  if (err) {
+    error_count++;
+    console.log('error!: ' + err.code);
+    console.log('stdout: ' + JSON.stringify(stdout));
+    console.log('stderr: ' + JSON.stringify(stderr));
+    assert.equal(false, err.killed);
+  } else {
+    success_count++;
+    assert.equal(true, stdout != "");
+  }
+}, {'HELLO' : 'WORLD'});
+
+child.stdout.setEncoding('utf8');
+
+child.stdout.addListener('data', function (chunk) {
+  response += chunk;
+});
+
+process.addListener('exit', function () {
+  assert.equal(1, success_count);
+  assert.equal(0, error_count);
+  assert.ok(response.indexOf('HELLO=WORLD') >= 0);
+});