diff --git a/phpBB/includes/extension/finder.php b/phpBB/includes/extension/finder.php
index 7ba477582c..e94a94c733 100644
--- a/phpBB/includes/extension/finder.php
+++ b/phpBB/includes/extension/finder.php
@@ -26,6 +26,7 @@ class phpbb_extension_finder
 	protected $phpbb_root_path;
 	protected $cache;
 	protected $phpEx;
+	protected $cache_name;
 
 	/**
 	* @var	array	An associative array, containing all search parameters set in
@@ -48,13 +49,16 @@ class phpbb_extension_finder
 	* @param string $phpbb_root_path Path to the phpbb root directory
 	* @param phpbb_cache_driver_interface $cache A cache instance or null
 	* @param string $phpEx php file extension
+	* @param string $cache_name The name of the cache variable, defaults to
+	*                           _ext_finder
 	*/
-	public function __construct(phpbb_extension_manager $extension_manager, $phpbb_root_path = '', phpbb_cache_driver_interface $cache = null, $phpEx = '.php')
+	public function __construct(phpbb_extension_manager $extension_manager, $phpbb_root_path = '', phpbb_cache_driver_interface $cache = null, $phpEx = '.php', $cache_name = '_ext_finder')
 	{
 		$this->extension_manager = $extension_manager;
 		$this->phpbb_root_path = $phpbb_root_path;
 		$this->cache = $cache;
 		$this->phpEx = $phpEx;
+		$this->cache_name = $cache_name;
 
 		$this->query = array(
 			'default_path' => false,
@@ -66,7 +70,7 @@ class phpbb_extension_finder
 			'directory' => false,
 		);
 
-		$this->cached_queries = ($this->cache) ? $this->cache->get('_ext_finder') : false;
+		$this->cached_queries = ($this->cache) ? $this->cache->get($this->cache_name) : false;
 	}
 
 	/**
@@ -284,7 +288,7 @@ class phpbb_extension_finder
 		if ($cache && $this->cache)
 		{
 			$this->cached_queries[$query] = $files;
-			$this->cache->put('_ext_finder', $this->cached_queries);
+			$this->cache->put($this->cache_name, $this->cached_queries);
 		}
 
 		return $files;
diff --git a/phpBB/includes/extension/manager.php b/phpBB/includes/extension/manager.php
index 45250e623a..443eaf011b 100644
--- a/phpBB/includes/extension/manager.php
+++ b/phpBB/includes/extension/manager.php
@@ -27,6 +27,7 @@ class phpbb_extension_manager
 	protected $extensions;
 	protected $extension_table;
 	protected $phpbb_root_path;
+	protected $cache_name;
 
 	/**
 	* Creates a manager and loads information from database
@@ -36,16 +37,18 @@ class phpbb_extension_manager
 	* @param string $phpbb_root_path Path to the phpbb includes directory.
 	* @param string $phpEx php file extension
 	* @param phpbb_cache_driver_interface $cache A cache instance or null
+	* @param string $cache_name The name of the cache variable, defaults to _ext
 	*/
-	public function __construct(dbal $db, $extension_table, $phpbb_root_path, $phpEx = '.php', phpbb_cache_driver_interface $cache = null)
+	public function __construct(dbal $db, $extension_table, $phpbb_root_path, $phpEx = '.php', phpbb_cache_driver_interface $cache = null, $cache_name = '_ext')
 	{
 		$this->phpbb_root_path = $phpbb_root_path;
 		$this->db = $db;
 		$this->cache = $cache;
 		$this->phpEx = $phpEx;
 		$this->extension_table = $extension_table;
+		$this->cache_name = $cache_name;
 
-		$this->extensions = $this->cache->get('_ext');
+		$this->extensions = $this->cache->get($this->cache_name);
 
 		if ($this->extensions === false)
 		{
@@ -75,7 +78,7 @@ class phpbb_extension_manager
 		}
 
 		ksort($this->extensions);
-		$this->cache->put('_ext', $this->extensions);
+		$this->cache->put($this->cache_name, $this->extensions);
 	}
 
 	/**
@@ -356,6 +359,6 @@ class phpbb_extension_manager
 	*/
 	public function get_finder()
 	{
-		return new phpbb_extension_finder($this, $this->phpbb_root_path, $this->cache, $this->phpEx);
+		return new phpbb_extension_finder($this, $this->phpbb_root_path, $this->cache, $this->phpEx, $this->cache_name . '_finder');
 	}
 }
diff --git a/tests/extension/finder_test.php b/tests/extension/finder_test.php
index fb2faaf5c0..cae11a5bfa 100644
--- a/tests/extension/finder_test.php
+++ b/tests/extension/finder_test.php
@@ -125,7 +125,7 @@ class phpbb_extension_finder_test extends phpbb_test_case
 	public function test_get_classes_create_cache()
 	{
 		$cache = new phpbb_mock_cache;
-		$finder = new phpbb_extension_finder($this->extension_manager, dirname(__FILE__) . '/includes/', $cache);
+		$finder = new phpbb_extension_finder($this->extension_manager, dirname(__FILE__) . '/includes/', $cache, '.php', '_custom_cache_name');
 		$files = $finder->suffix('_class.php')->get_files();
 
 		sort($files);
@@ -147,7 +147,7 @@ class phpbb_extension_finder_test extends phpbb_test_case
 		);
 
 		$this->assertEquals($expected_files, $files);
-		$cache->checkAssociativeVar($this, '_extension_finder', array(
+		$cache->checkAssociativeVar($this, '_custom_cache_name', array(
 			md5(serialize($query)) => $expected_files,
 		));
 	}
@@ -165,7 +165,7 @@ class phpbb_extension_finder_test extends phpbb_test_case
 		);
 
 		$finder = new phpbb_extension_finder($this->extension_manager, dirname(__FILE__) . '/includes/', new phpbb_mock_cache(array(
-			'_extension_finder' => array(
+			'_ext_finder' => array(
 				md5(serialize($query)) => array('file_name'),
 			),
 		)));