diff --git a/.travis.yml b/.travis.yml
index b8a14d0..238a492 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,10 +4,9 @@ php:
   - '5.6'
   - '7.0'
   - '7.1'
-  - 'hhvm'
 install:
   - composer update
 script:
  - ./vendor/bin/phpunit --coverage-clover ./tests/Logs/clover.xml
 after_script:
-- php vendor/bin/php-coveralls -v
\ No newline at end of file
+- php vendor/bin/php-coveralls -v
diff --git a/src/Objects/CacheDrivers/DOFileCacheDriver.php b/src/Objects/CacheDrivers/DOFileCacheDriver.php
index cc26a17..6e48c9d 100644
--- a/src/Objects/CacheDrivers/DOFileCacheDriver.php
+++ b/src/Objects/CacheDrivers/DOFileCacheDriver.php
@@ -18,7 +18,7 @@ public function __construct()
             [
                 'cacheDirectory'  => '/tmp/php-uk-bank-holidays-cache/',
                 'gzipCompression' => true,
-                ]
+            ]
             );
     }
 
@@ -27,6 +27,7 @@ public function set($key, $value)
         $cacheItem = $this->cache->getItem($key);
         $cacheItem->set($value);
         $cacheItem->expiresAfter(self::CACHE_EXPIRY_IN_SECONDS);
+        $this->cache->save($cacheItem);
     }
 
     public function get($key)