diff --git a/src/Symfony/Component/Process/CHANGELOG.md b/src/Symfony/Component/Process/CHANGELOG.md
index 7fa5b72d50..8a3f631a4e 100644
--- a/src/Symfony/Component/Process/CHANGELOG.md
+++ b/src/Symfony/Component/Process/CHANGELOG.md
@@ -7,6 +7,7 @@ CHANGELOG
  * added ProcessBuilder::setArguments() to reset the arguments on a builder
  * added a way to retrieve the standard and error output incrementally
  * added Process:restart()
+ * added ProcessUtils::escapeArgument() to fix the bug in escapeshellarg() function on Windows
 
 2.1.0
 -----
diff --git a/src/Symfony/Component/Process/ProcessBuilder.php b/src/Symfony/Component/Process/ProcessBuilder.php
index 1a95bd0df4..45a5cd1d40 100644
--- a/src/Symfony/Component/Process/ProcessBuilder.php
+++ b/src/Symfony/Component/Process/ProcessBuilder.php
@@ -143,7 +143,7 @@ class ProcessBuilder
 
         $options = $this->options;
 
-        $script = implode(' ', array_map('escapeshellarg', $this->arguments));
+        $script = implode(' ', array_map(array(__NAMESPACE__.'\\ProcessUtils', 'escapeArgument'), $this->arguments));
 
         if ($this->inheritEnv) {
             $env = $this->env ? $this->env + $_ENV : null;
diff --git a/src/Symfony/Component/Process/ProcessUtils.php b/src/Symfony/Component/Process/ProcessUtils.php
new file mode 100644
index 0000000000..73380be84d
--- /dev/null
+++ b/src/Symfony/Component/Process/ProcessUtils.php
@@ -0,0 +1,60 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Process;
+
+/**
+ * ProcessUtils is a bunch of utility methods.
+ *
+ * This class contains static methods only and is not meant to be instantiated.
+ *
+ * @author Martin Hasoň <martin.hason@gmail.com>
+ */
+class ProcessUtils
+{
+    /**
+     * This class should not be instantiated
+     */
+    private function __construct()
+    {
+    }
+
+    /**
+     * Escapes a string to be used as a shell argument.
+     *
+     * @param string $argument The argument that will be escaped
+     *
+     * @return string The escaped argument
+     */
+    public static function escapeArgument($argument)
+    {
+        //Fix for PHP bug #43784 escapeshellarg removes % from given string
+        //Fix for PHP bug #49446 escapeshellarg dosn`t work on windows
+        //@see https://bugs.php.net/bug.php?id=43784
+        //@see https://bugs.php.net/bug.php?id=49446
+        if (defined('PHP_WINDOWS_VERSION_BUILD')) {
+            $escapedArgument = '';
+            foreach(preg_split('/([%"])/i', $argument, -1, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE) as $part) {
+                if ('"' == $part) {
+                    $escapedArgument .= '\\"';
+                } elseif ('%' == $part) {
+                    $escapedArgument .= '^%';
+                } else {
+                    $escapedArgument .= escapeshellarg($part);
+                }
+            }
+
+            return $escapedArgument;
+        }
+
+        return escapeshellarg($argument);
+    }
+}
diff --git a/src/Symfony/Component/Process/Tests/ProcessBuilderTest.php b/src/Symfony/Component/Process/Tests/ProcessBuilderTest.php
index 38e1491090..585aa9f137 100644
--- a/src/Symfony/Component/Process/Tests/ProcessBuilderTest.php
+++ b/src/Symfony/Component/Process/Tests/ProcessBuilderTest.php
@@ -115,4 +115,16 @@ class ProcessBuilderTest extends \PHPUnit_Framework_TestCase
 
         $this->assertContains("second", $proc->getCommandLine());
     }
+
+    public function testShouldEscapeArguments()
+    {
+        $pb = new ProcessBuilder(array('%path%', 'foo " bar'));
+        $proc = $pb->getProcess();
+
+        if (defined('PHP_WINDOWS_VERSION_BUILD')) {
+            $this->assertSame('^%"path"^% "foo "\\"" bar"', $proc->getCommandLine());
+        } else {
+            $this->assertSame("'%path%' 'foo \" bar'", $proc->getCommandLine());
+        }
+    }
 }
diff --git a/src/Symfony/Component/Process/Tests/ProcessUtilsTest.php b/src/Symfony/Component/Process/Tests/ProcessUtilsTest.php
new file mode 100644
index 0000000000..e51da5a5e2
--- /dev/null
+++ b/src/Symfony/Component/Process/Tests/ProcessUtilsTest.php
@@ -0,0 +1,42 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Process\Tests;
+
+use Symfony\Component\Process\ProcessUtils;
+
+class ProcessUtilsTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @dataProvider dataArguments
+     */
+    public function testEscapeArgument($result, $argument)
+    {
+        $this->assertSame($result, ProcessUtils::escapeArgument($argument));
+    }
+
+    public function dataArguments()
+    {
+        if (defined('PHP_WINDOWS_VERSION_BUILD')) {
+            return array(
+                array('"foo bar"', 'foo bar'),
+                array('^%"path"^%', '%path%'),
+                array('"<|>"\\"" "\\""\'f"', '<|>" "\'f'),
+            );
+        }
+
+        return array(
+            array("'foo bar'", 'foo bar'),
+            array("'%path%'", '%path%'),
+            array("'<|>\" \"'\\''f'", '<|>" "\'f'),
+        );
+    }
+}