diff --git a/src/Symfony/Bridge/Monolog/Handler/ChromePhpHandler.php b/src/Symfony/Bridge/Monolog/Handler/ChromePhpHandler.php
index c27b0803e200..c8e21b2f4262 100644
--- a/src/Symfony/Bridge/Monolog/Handler/ChromePhpHandler.php
+++ b/src/Symfony/Bridge/Monolog/Handler/ChromePhpHandler.php
@@ -39,7 +39,7 @@ public function onKernelResponse(FilterResponseEvent $event)
         }
 
         if (!preg_match(static::USER_AGENT_REGEX, $event->getRequest()->headers->get('User-Agent'))) {
-            $this->sendHeaders = false;
+            self::$sendHeaders = false;
             $this->headers = [];
 
             return;
@@ -57,7 +57,7 @@ public function onKernelResponse(FilterResponseEvent $event)
      */
     protected function sendHeader($header, $content)
     {
-        if (!$this->sendHeaders) {
+        if (!self::$sendHeaders) {
             return;
         }