diff --git a/src/Symfony/Component/HttpFoundation/Response.php b/src/Symfony/Component/HttpFoundation/Response.php
index 4d63219b2db2..b7d116259d6f 100644
--- a/src/Symfony/Component/HttpFoundation/Response.php
+++ b/src/Symfony/Component/HttpFoundation/Response.php
@@ -310,9 +310,9 @@ public function prepare(Request $request)
         }
 
         // Check if we need to send extra expire info headers
-        if ('1.0' == $this->getProtocolVersion() && false !== strpos($this->headers->get('Cache-Control'), 'no-cache')) {
-            $this->headers->set('pragma', 'no-cache');
-            $this->headers->set('expires', -1);
+        if ('1.0' == $this->getProtocolVersion() && false !== strpos($headers->get('Cache-Control'), 'no-cache')) {
+            $headers->set('pragma', 'no-cache');
+            $headers->set('expires', -1);
         }
 
         $this->ensureIEOverSSLCompatibility($request);