diff --git a/src/Cache/Engine/MemcachedEngine.php b/src/Cache/Engine/MemcachedEngine.php
index c877ca17b0e..a71377b9b37 100644
--- a/src/Cache/Engine/MemcachedEngine.php
+++ b/src/Cache/Engine/MemcachedEngine.php
@@ -241,7 +241,7 @@ protected function _setOptions()
      */
     protected function _parseServerString($server)
     {
-        if ($server[0] === 'u') {
+        if (strpos($server, 'unix://') === 0) {
             return [$server, 0];
         }
         if (substr($server, 0, 1) === '[') {
diff --git a/tests/TestCase/Cache/Engine/MemcachedEngineTest.php b/tests/TestCase/Cache/Engine/MemcachedEngineTest.php
index 3d5cf1f27a1..355a74ffba3 100644
--- a/tests/TestCase/Cache/Engine/MemcachedEngineTest.php
+++ b/tests/TestCase/Cache/Engine/MemcachedEngineTest.php
@@ -445,6 +445,18 @@ public function testConnectIpv6()
         $this->assertTrue($result);
     }
 
+    /**
+     * test domain starts with u
+     *
+     * @return void
+     */
+    public function testParseServerStringWithU()
+    {
+        $Memcached = new TestMemcachedEngine();
+        $result = $Memcached->parseServerString('udomain.net:13211');
+        $this->assertEquals(array('udomain.net', '13211'), $result);
+    }
+
     /**
      * test non latin domains.
      *