diff --git a/Tests/Session/Storage/Handler/AbstractRedisSessionHandlerTestCase.php b/Tests/Session/Storage/Handler/AbstractRedisSessionHandlerTestCase.php
index 0288abd9f..a582909a0 100644
--- a/Tests/Session/Storage/Handler/AbstractRedisSessionHandlerTestCase.php
+++ b/Tests/Session/Storage/Handler/AbstractRedisSessionHandlerTestCase.php
@@ -89,7 +89,7 @@ public function testUseSessionGcMaxLifetimeAsTimeToLive()
 
     public function testDestroySession()
     {
-        $this->storage->open('', '');
+        $this->storage->open('', 'test');
         $this->redisClient->set(self::PREFIX.'id', 'foo');
 
         $this->assertTrue((bool) $this->redisClient->exists(self::PREFIX.'id'));
diff --git a/Tests/Session/Storage/Handler/MemcachedSessionHandlerTest.php b/Tests/Session/Storage/Handler/MemcachedSessionHandlerTest.php
index 15616e3f9..60bae22c3 100644
--- a/Tests/Session/Storage/Handler/MemcachedSessionHandlerTest.php
+++ b/Tests/Session/Storage/Handler/MemcachedSessionHandlerTest.php
@@ -109,7 +109,7 @@ public function testWriteSessionWithLargeTTL()
 
     public function testDestroySession()
     {
-        $this->storage->open('', '');
+        $this->storage->open('', 'sid');
         $this->memcached
             ->expects($this->once())
             ->method('delete')