diff --git a/appveyor.yml b/appveyor.yml
index 6d869967263bd..9ff140b0a280c 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -31,6 +31,7 @@ install:
     - 7z x php_memcache-3.0.8-5.3-nts-vc9-x86.zip -y >nul
     - cd ..
     - copy /Y php.ini-development php.ini-min
+    - echo memory_limit=-1 >> php.ini-min
     - echo serialize_precision=14 >> php.ini-min
     - echo max_execution_time=1200 >> php.ini-min
     - echo date.timezone="America/Los_Angeles" >> php.ini-min
diff --git a/src/Symfony/Component/Security/Http/Firewall/ContextListener.php b/src/Symfony/Component/Security/Http/Firewall/ContextListener.php
index 7a3483b2ecc81..2c315b99448a5 100644
--- a/src/Symfony/Component/Security/Http/Firewall/ContextListener.php
+++ b/src/Symfony/Component/Security/Http/Firewall/ContextListener.php
@@ -39,8 +39,6 @@ class ContextListener implements ListenerInterface
     private $dispatcher;
     private $registered;
 
-    private static $unserializeExceptionCode = 0x37313bc;
-
     public function __construct(TokenStorageInterface $tokenStorage, array $userProviders, $contextKey, LoggerInterface $logger = null, EventDispatcherInterface $dispatcher = null)
     {
         if (empty($contextKey)) {
@@ -180,7 +178,7 @@ private function safelyUnserialize($serializedToken)
         $prevUnserializeHandler = ini_set('unserialize_callback_func', __CLASS__.'::handleUnserializeCallback');
         $prevErrorHandler = set_error_handler(function ($type, $msg, $file, $line, $context = array()) use (&$prevErrorHandler) {
             if (__FILE__ === $file) {
-                throw new \UnexpectedValueException($msg, self::$unserializeExceptionCode);
+                throw new \UnexpectedValueException($msg, 0x37313bc);
             }
 
             return $prevErrorHandler ? $prevErrorHandler($type, $msg, $file, $line, $context) : false;
@@ -194,7 +192,7 @@ private function safelyUnserialize($serializedToken)
         restore_error_handler();
         ini_set('unserialize_callback_func', $prevUnserializeHandler);
         if ($e) {
-            if (!$e instanceof \UnexpectedValueException || self::$unserializeExceptionCode !== $e->getCode()) {
+            if (!$e instanceof \UnexpectedValueException || 0x37313bc !== $e->getCode()) {
                 throw $e;
             }
             if ($this->logger) {
@@ -210,6 +208,6 @@ private function safelyUnserialize($serializedToken)
      */
     public static function handleUnserializeCallback($class)
     {
-        throw new \UnexpectedValueException('Class not found: '.$class, self::$unserializeExceptionCode);
+        throw new \UnexpectedValueException('Class not found: '.$class, 0x37313bc);
     }
 }