diff --git a/lib/Doctrine/ORM/Cache/DefaultCacheFactory.php b/lib/Doctrine/ORM/Cache/DefaultCacheFactory.php
index 151009632..3bfccdf84 100644
--- a/lib/Doctrine/ORM/Cache/DefaultCacheFactory.php
+++ b/lib/Doctrine/ORM/Cache/DefaultCacheFactory.php
@@ -200,14 +200,9 @@ class DefaultCacheFactory implements CacheFactory
             return $this->regions[$cache['region']];
         }
 
-        $cacheAdapter = clone $this->cache;
-
-        if ($cacheAdapter instanceof CacheProvider) {
-            $cacheAdapter->setNamespace($cache['region']);
-        }
-
-        $name     = $cache['region'];
-        $lifetime = $this->regionsConfig->getLifetime($cache['region']);
+        $name         = $cache['region'];
+        $cacheAdapter = $this->createRegionCache($name);
+        $lifetime     = $this->regionsConfig->getLifetime($cache['region']);
 
         $region = ($cacheAdapter instanceof MultiGetCache)
             ? new DefaultMultiGetRegion($name, $cacheAdapter, $lifetime)
@@ -229,6 +224,30 @@ class DefaultCacheFactory implements CacheFactory
         return $this->regions[$cache['region']] = $region;
     }
 
+    /**
+     * @param string $name
+     *
+     * @return CacheAdapter
+     */
+    private function createRegionCache($name)
+    {
+        $cacheAdapter = clone $this->cache;
+
+        if (!$cacheAdapter instanceof CacheProvider) {
+            return $cacheAdapter;
+        }
+
+        $namespace = $cacheAdapter->getNamespace();
+
+        if ('' !== $namespace) {
+            $namespace .= ':';
+        }
+
+        $cacheAdapter->setNamespace($namespace . $name);
+
+        return $cacheAdapter;
+    }
+
     /**
      * {@inheritdoc}
      */
diff --git a/tests/Doctrine/Tests/ORM/Cache/DefaultCacheFactoryTest.php b/tests/Doctrine/Tests/ORM/Cache/DefaultCacheFactoryTest.php
index 2047e05b3..90922caed 100644
--- a/tests/Doctrine/Tests/ORM/Cache/DefaultCacheFactoryTest.php
+++ b/tests/Doctrine/Tests/ORM/Cache/DefaultCacheFactoryTest.php
@@ -296,6 +296,30 @@ class DefaultCacheFactoryTest extends OrmTestCase
         $this->assertSame('bar', $barRegion->getCache()->getNamespace());
     }
 
+    public function testAppendsNamespacedCacheInstancePerRegionInstanceWhenItsAlreadySet()
+    {
+        $cache = clone $this->getSharedSecondLevelCacheDriverImpl();
+        $cache->setNamespace('testing');
+
+        $factory = new DefaultCacheFactory($this->regionsConfig, $cache);
+
+        $fooRegion = $factory->getRegion(
+            [
+                'region' => 'foo',
+                'usage'  => ClassMetadata::CACHE_USAGE_READ_ONLY,
+            ]
+        );
+        $barRegion = $factory->getRegion(
+            [
+                'region' => 'bar',
+                'usage'  => ClassMetadata::CACHE_USAGE_READ_ONLY,
+            ]
+        );
+
+        $this->assertSame('testing:foo', $fooRegion->getCache()->getNamespace());
+        $this->assertSame('testing:bar', $barRegion->getCache()->getNamespace());
+    }
+
     public function testBuildsDefaultCacheRegionFromGenericCacheRegion()
     {
         /* @var $cache \Doctrine\Common\Cache\Cache */