diff --git a/src/Symfony/Component/Semaphore/Semaphore.php b/src/Symfony/Component/Semaphore/Semaphore.php
index a65e2bc289..572b5f16ce 100644
--- a/src/Symfony/Component/Semaphore/Semaphore.php
+++ b/src/Symfony/Component/Semaphore/Semaphore.php
@@ -48,6 +48,16 @@ final class Semaphore implements SemaphoreInterface, LoggerAwareInterface
         $this->logger = new NullLogger();
     }
 
+    public function __sleep()
+    {
+        throw new \BadMethodCallException('Cannot serialize '.__CLASS__);
+    }
+
+    public function __wakeup()
+    {
+        throw new \BadMethodCallException('Cannot unserialize '.__CLASS__);
+    }
+
     /**
      * Automatically releases the underlying semaphore when the object is destructed.
      */