diff --git a/src/Symfony/Bridge/Monolog/Handler/FirePHPHandler.php b/src/Symfony/Bridge/Monolog/Handler/FirePHPHandler.php
index 056496ae13..966a7baf83 100644
--- a/src/Symfony/Bridge/Monolog/Handler/FirePHPHandler.php
+++ b/src/Symfony/Bridge/Monolog/Handler/FirePHPHandler.php
@@ -38,9 +38,10 @@ class FirePHPHandler extends BaseFirePHPHandler
             return;
         }
 
-        if (!preg_match('{\bFirePHP/\d+\.\d+\b}', $event->getRequest()->headers->get('User-Agent'))
-            && !$event->getRequest()->headers->has('X-FirePHP-Version')) {
-            $this->sendHeaders = false;
+        $request = $event->getRequest();
+        if (!preg_match('{\bFirePHP/\d+\.\d+\b}', $request->headers->get('User-Agent'))
+            && !$request->headers->has('X-FirePHP-Version')) {
+            self::$sendHeaders = false;
             $this->headers = array();
 
             return;
@@ -58,7 +59,7 @@ class FirePHPHandler extends BaseFirePHPHandler
      */
     protected function sendHeader($header, $content)
     {
-        if (!$this->sendHeaders) {
+        if (!self::$sendHeaders) {
             return;
         }