diff --git a/src/Symfony/Component/Cache/Tests/Adapter/MemcachedAdapterTest.php b/src/Symfony/Component/Cache/Tests/Adapter/MemcachedAdapterTest.php
index 59d28a33c1..1f2f4d40ac 100644
--- a/src/Symfony/Component/Cache/Tests/Adapter/MemcachedAdapterTest.php
+++ b/src/Symfony/Component/Cache/Tests/Adapter/MemcachedAdapterTest.php
@@ -192,4 +192,9 @@ class MemcachedAdapterTest extends AdapterTestCase
             array(\Memcached::OPT_SOCKET_RECV_SIZE => 1, \Memcached::OPT_SOCKET_SEND_SIZE => 2, \Memcached::OPT_RETRY_TIMEOUT => 8),
         );
     }
+
+    public function testClear()
+    {
+        $this->assertTrue($this->createCachePool()->clear());
+    }
 }
diff --git a/src/Symfony/Component/Cache/Traits/MemcachedTrait.php b/src/Symfony/Component/Cache/Traits/MemcachedTrait.php
index cf04f1cf85..8160f14116 100644
--- a/src/Symfony/Component/Cache/Traits/MemcachedTrait.php
+++ b/src/Symfony/Component/Cache/Traits/MemcachedTrait.php
@@ -260,7 +260,7 @@ trait MemcachedTrait
      */
     protected function doClear($namespace)
     {
-        return false;
+        return '' === $namespace && $this->getClient()->flush();
     }
 
     private function checkResultCode($result)