diff --git a/src/Symfony/Bridge/Monolog/Processor/WebProcessor.php b/src/Symfony/Bridge/Monolog/Processor/WebProcessor.php
index 375b505a7d..543bc61ed6 100644
--- a/src/Symfony/Bridge/Monolog/Processor/WebProcessor.php
+++ b/src/Symfony/Bridge/Monolog/Processor/WebProcessor.php
@@ -22,10 +22,10 @@ use Symfony\Component\HttpKernel\HttpKernelInterface;
  */
 class WebProcessor extends BaseWebProcessor
 {
-    public function __construct()
+    public function __construct(array $extraFields = null)
     {
         // Pass an empty array as the default null value would access $_SERVER
-        parent::__construct(array());
+        parent::__construct(array(), $extraFields);
     }
 
     public function onKernelRequest(GetResponseEvent $event)
diff --git a/src/Symfony/Bridge/Monolog/Tests/Processor/WebProcessorTest.php b/src/Symfony/Bridge/Monolog/Tests/Processor/WebProcessorTest.php
index 751e6095e2..95841fc144 100644
--- a/src/Symfony/Bridge/Monolog/Tests/Processor/WebProcessorTest.php
+++ b/src/Symfony/Bridge/Monolog/Tests/Processor/WebProcessorTest.php
@@ -19,6 +19,42 @@ use Symfony\Component\HttpKernel\HttpKernelInterface;
 class WebProcessorTest extends \PHPUnit_Framework_TestCase
 {
     public function testUsesRequestServerData()
+    {
+        list($event, $server) = $this->createRequestEvent();
+
+        $processor = new WebProcessor();
+        $processor->onKernelRequest($event);
+        $record = $processor($this->getRecord());
+
+        $this->assertCount(5, $record['extra']);
+        $this->assertEquals($server['REQUEST_URI'], $record['extra']['url']);
+        $this->assertEquals($server['REMOTE_ADDR'], $record['extra']['ip']);
+        $this->assertEquals($server['REQUEST_METHOD'], $record['extra']['http_method']);
+        $this->assertEquals($server['SERVER_NAME'], $record['extra']['server']);
+        $this->assertEquals($server['HTTP_REFERER'], $record['extra']['referrer']);
+    }
+
+    public function testCanBeConstructedWithExtraFields()
+    {
+        if (!$this->isExtraFieldsSupported()) {
+            $this->markTestSkipped('WebProcessor of the installed Monolog version does not support $extraFields parameter');
+        }
+
+        list($event, $server) = $this->createRequestEvent();
+
+        $processor = new WebProcessor(array('url', 'referrer'));
+        $processor->onKernelRequest($event);
+        $record = $processor($this->getRecord());
+
+        $this->assertCount(2, $record['extra']);
+        $this->assertEquals($server['REQUEST_URI'], $record['extra']['url']);
+        $this->assertEquals($server['HTTP_REFERER'], $record['extra']['referrer']);
+    }
+
+    /**
+     * @return array
+     */
+    private function createRequestEvent()
     {
         $server = array(
             'REQUEST_URI' => 'A',
@@ -41,15 +77,7 @@ class WebProcessorTest extends \PHPUnit_Framework_TestCase
             ->method('getRequest')
             ->will($this->returnValue($request));
 
-        $processor = new WebProcessor();
-        $processor->onKernelRequest($event);
-        $record = $processor($this->getRecord());
-
-        $this->assertEquals($server['REQUEST_URI'], $record['extra']['url']);
-        $this->assertEquals($server['REMOTE_ADDR'], $record['extra']['ip']);
-        $this->assertEquals($server['REQUEST_METHOD'], $record['extra']['http_method']);
-        $this->assertEquals($server['SERVER_NAME'], $record['extra']['server']);
-        $this->assertEquals($server['HTTP_REFERER'], $record['extra']['referrer']);
+        return array($event, $server);
     }
 
     /**
@@ -58,7 +86,7 @@ class WebProcessorTest extends \PHPUnit_Framework_TestCase
      *
      * @return array Record
      */
-    protected function getRecord($level = Logger::WARNING, $message = 'test')
+    private function getRecord($level = Logger::WARNING, $message = 'test')
     {
         return array(
             'message' => $message,
@@ -70,4 +98,17 @@ class WebProcessorTest extends \PHPUnit_Framework_TestCase
             'extra' => array(),
         );
     }
+
+    private function isExtraFieldsSupported()
+    {
+        $monologWebProcessorClass = new \ReflectionClass('Monolog\Processor\WebProcessor');
+
+        foreach ($monologWebProcessorClass->getConstructor()->getParameters() as $parameter) {
+            if ('extraFields' === $parameter->getName()) {
+                return true;
+            }
+        }
+
+        return false;
+    }
 }