diff --git a/src/Symfony/Component/Cache/Adapter/NullAdapter.php b/src/Symfony/Component/Cache/Adapter/NullAdapter.php
index a2fdd36373..81f772fd88 100644
--- a/src/Symfony/Component/Cache/Adapter/NullAdapter.php
+++ b/src/Symfony/Component/Cache/Adapter/NullAdapter.php
@@ -114,7 +114,7 @@ class NullAdapter implements AdapterInterface, CacheInterface
      */
     public function save(CacheItemInterface $item)
     {
-        return false;
+        return true;
     }
 
     /**
@@ -124,7 +124,7 @@ class NullAdapter implements AdapterInterface, CacheInterface
      */
     public function saveDeferred(CacheItemInterface $item)
     {
-        return false;
+        return true;
     }
 
     /**
@@ -134,7 +134,7 @@ class NullAdapter implements AdapterInterface, CacheInterface
      */
     public function commit()
     {
-        return false;
+        return true;
     }
 
     /**
diff --git a/src/Symfony/Component/Cache/Tests/Adapter/NullAdapterTest.php b/src/Symfony/Component/Cache/Tests/Adapter/NullAdapterTest.php
index ae3de76dc1..3192dff999 100644
--- a/src/Symfony/Component/Cache/Tests/Adapter/NullAdapterTest.php
+++ b/src/Symfony/Component/Cache/Tests/Adapter/NullAdapterTest.php
@@ -113,7 +113,7 @@ class NullAdapterTest extends TestCase
         $this->assertFalse($item->isHit());
         $this->assertNull($item->get(), "Item's value must be null when isHit is false.");
 
-        $this->assertFalse($adapter->save($item));
+        $this->assertTrue($adapter->save($item));
     }
 
     public function testDeferredSave()
@@ -124,7 +124,7 @@ class NullAdapterTest extends TestCase
         $this->assertFalse($item->isHit());
         $this->assertNull($item->get(), "Item's value must be null when isHit is false.");
 
-        $this->assertFalse($adapter->saveDeferred($item));
+        $this->assertTrue($adapter->saveDeferred($item));
     }
 
     public function testCommit()
@@ -135,7 +135,7 @@ class NullAdapterTest extends TestCase
         $this->assertFalse($item->isHit());
         $this->assertNull($item->get(), "Item's value must be null when isHit is false.");
 
-        $this->assertFalse($adapter->saveDeferred($item));
-        $this->assertFalse($this->createCachePool()->commit());
+        $this->assertTrue($adapter->saveDeferred($item));
+        $this->assertTrue($this->createCachePool()->commit());
     }
 }