diff --git a/phpBB/config/default/container/services_twig.yml b/phpBB/config/default/container/services_twig.yml
index f3ad95207d..367886804c 100644
--- a/phpBB/config/default/container/services_twig.yml
+++ b/phpBB/config/default/container/services_twig.yml
@@ -37,19 +37,13 @@ services:
     template.twig.extensions.phpbb:
         class: phpbb\template\twig\extension
         arguments:
+            - '@auth'
             - '@template_context'
             - '@template.twig.environment'
             - '@language'
         tags:
             - { name: twig.extension }
 
-    template.twig.extensions.auth:
-        class: phpbb\template\twig\extension\auth
-        arguments:
-            - '@auth'
-        tags:
-            - { name: twig.extension }
-
     template.twig.extensions.avatar:
         class: phpbb\template\twig\extension\avatar
         tags:
diff --git a/phpBB/phpbb/template/twig/extension.php b/phpBB/phpbb/template/twig/extension.php
index c5b3db1aaf..5bb0c67291 100644
--- a/phpBB/phpbb/template/twig/extension.php
+++ b/phpBB/phpbb/template/twig/extension.php
@@ -15,6 +15,9 @@ namespace phpbb\template\twig;
 
 class extension extends \Twig_Extension
 {
+	/** @var \phpbb\auth\auth */
+	protected $auth;
+
 	/** @var \phpbb\template\context */
 	protected $context;
 
@@ -27,13 +30,14 @@ class extension extends \Twig_Extension
 	/**
 	* Constructor
 	*
+	* @param \phpbb\auth\auth $auth
 	* @param \phpbb\template\context $context
 	* @param \phpbb\template\twig\environment $environment
 	* @param \phpbb\language\language $language
-	* @return \phpbb\template\twig\extension
 	*/
-	public function __construct(\phpbb\template\context $context, \phpbb\template\twig\environment $environment, $language)
+	public function __construct(\phpbb\auth\auth $auth, \phpbb\template\context $context, \phpbb\template\twig\environment $environment, $language)
 	{
+		$this->auth = $auth;
 		$this->context = $context;
 		$this->environment = $environment;
 		$this->language = $language;
@@ -91,6 +95,8 @@ class extension extends \Twig_Extension
 		return array(
 			new \Twig_SimpleFunction('lang', array($this, 'lang')),
 			new \Twig_SimpleFunction('lang_defined', array($this, 'lang_defined')),
+			new \Twig_SimpleFunction('auth', array($this, 'get_auth')),
+			new \Twig_SimpleFunction('auth_global', array($this, 'get_auth_global')),
 		);
 	}
 
@@ -198,4 +204,42 @@ class extension extends \Twig_Extension
 	{
 		return call_user_func_array([$this->language, 'is_set'], [$key]);
 	}
+
+	/**
+	 * Look up permission option(s).
+	 *
+	 * How to use in a template:
+	 * - {{ auth(options, forum_id) }}
+	 *
+	 * The options are required, either as a single string 'a_' or as a twig array ['a_', 'm_'].
+	 * The forum identifier is optional.
+	 *
+	 * @return bool
+	 */
+	public function get_auth()
+	{
+		$args = func_get_args();
+
+		$options = $args[0];
+		$forum_id = isset($args[1]) ? (int) $args[1] : 0;
+
+		return is_array($options) ? $this->auth->acl_gets($options, $forum_id) : $this->auth->acl_get($options, $forum_id);
+	}
+
+	/**
+	 * Look up permission option(s) for any forum
+	 *
+	 * How to use in a template:
+	 * - {{ auth_global(options) }}
+	 *
+	 * The options are required, either as a single string 'a_' or as a twig array ['a_', 'm_'].
+	 *
+	 * @return bool
+	 */
+	public function get_auth_global()
+	{
+		$args = func_get_args();
+
+		return $this->auth->acl_getf_global($args);
+	}
 }
diff --git a/phpBB/phpbb/template/twig/extension/auth.php b/phpBB/phpbb/template/twig/extension/auth.php
deleted file mode 100644
index 9dbe306782..0000000000
--- a/phpBB/phpbb/template/twig/extension/auth.php
+++ /dev/null
@@ -1,91 +0,0 @@
-<?php
-/**
- *
- * This file is part of the phpBB Forum Software package.
- *
- * @copyright (c) phpBB Limited <https://www.phpbb.com>
- * @license GNU General Public License, version 2 (GPL-2.0)
- *
- * For full copyright and license information, please see
- * the docs/CREDITS.txt file.
- *
- */
-
-namespace phpbb\template\twig\extension;
-
-class auth extends \Twig_Extension
-{
-	/** @var \phpbb\auth\auth */
-	protected $auth;
-
-	/**
-	 * Constructor.
-	 *
-	 * @param \phpbb\auth\auth	$auth	Authentication object
-	 */
-	public function __construct(\phpbb\auth\auth $auth)
-	{
-		$this->auth = $auth;
-	}
-
-	/**
-	 * Get the name of this extension
-	 *
-	 * @return string
-	 */
-	public function getName()
-	{
-		return 'auth';
-	}
-
-	/**
-	 * Returns a list of global functions to add to the existing list.
-	 *
-	 * @return array An array of global functions
-	 */
-	public function getFunctions()
-	{
-		return array(
-			new \Twig_SimpleFunction('auth', array($this, 'get_auth')),
-			new \Twig_SimpleFunction('auth_global', array($this, 'get_auth_global')),
-		);
-	}
-
-	/**
-	 * Look up permission option(s).
-	 *
-	 * How to use in a template:
-	 * - {{ auth(options, forum_id) }}
-	 *
-	 * The options are required, either as a single string 'a_' or as a twig array ['a_', 'm_'].
-	 * The forum identifier is optional.
-	 *
-	 * @return bool
-	 */
-	public function get_auth()
-	{
-		$args = func_get_args();
-
-		$options = $args[0];
-		$forum_id = isset($args[1]) ? (int) $args[1] : 0;
-
-		return is_array($options) ? $this->auth->acl_gets($options, $forum_id) : $this->auth->acl_get($options, $forum_id);
-	}
-
-	/**
-	 * Look up permission option(s) for any forum
-	 *
-	 * How to use in a template:
-	 * - {{ auth_global(options) }}
-	 *
-	 * The options are required, either as a single string 'a_' or as a twig array ['a_', 'm_'].
-	 *
-	 * @return bool
-	 */
-	public function get_auth_global()
-	{
-		$args = func_get_args();
-
-		return $this->auth->acl_getf_global($args);
-	}
-}
diff --git a/phpBB/phpbb/template/twig/extension/username.php b/phpBB/phpbb/template/twig/extension/username.php
index c80396b116..ef149693a0 100644
--- a/phpBB/phpbb/template/twig/extension/username.php
+++ b/phpBB/phpbb/template/twig/extension/username.php
@@ -79,7 +79,6 @@ class username extends \Twig_Extension
 			$custom_profile_url = isset($args[5]) ? $args[5] : false;
 		}
 
-
 		return get_username_string($mode, $user_id, $username, $user_colour, $guest_username, $custom_profile_url);
 	}
 }
diff --git a/tests/controller/common_helper_route.php b/tests/controller/common_helper_route.php
index 447c10d10e..3d3578ab43 100644
--- a/tests/controller/common_helper_route.php
+++ b/tests/controller/common_helper_route.php
@@ -74,7 +74,9 @@ abstract class phpbb_controller_common_helper_route extends phpbb_test_case
 
 	protected function generate_route_objects()
 	{
-		global $request;
+		global $request, $phpbb_root_path, $phpEx;
+
+		$auth = $this->getMock('\phpbb\auth\auth');
 
 		$this->request = new phpbb_mock_request();
 		$this->request->overwrite('SCRIPT_NAME', $this->get_uri(), \phpbb\request\request_interface::SERVER);
@@ -122,7 +124,7 @@ abstract class phpbb_controller_common_helper_route extends phpbb_test_case
 				'autoescape'	=> false,
 			)
 		);
-		$this->template = new phpbb\template\twig\twig($this->phpbb_path_helper, $this->config, $context, $twig, $cache_path, $this->user, array(new \phpbb\template\twig\extension($context, $twig, $this->user)));
+		$this->template = new phpbb\template\twig\twig($this->phpbb_path_helper, $this->config, $context, $twig, $cache_path, $this->user, array(new \phpbb\template\twig\extension($auth, $context, $twig, $this->user)));
 		$twig->setLexer(new \phpbb\template\twig\lexer($twig));
 
 		$this->extension_manager = new phpbb_mock_extension_manager(
diff --git a/tests/email/email_parsing_test.php b/tests/email/email_parsing_test.php
index 629df9abb6..1b5c6aaa8c 100644
--- a/tests/email/email_parsing_test.php
+++ b/tests/email/email_parsing_test.php
@@ -66,7 +66,15 @@ class phpbb_email_parsing_test extends phpbb_test_case
 		);
 		$phpbb_container->set('ext.manager', $extension_manager);
 
+		$auth = $this->getMock('\phpbb\auth\auth');
 		$context = new \phpbb\template\context();
+		$twig_extension = new \phpbb\template\twig\extension($auth, $context, $lang);
+		$phpbb_container->set('template.twig.extensions.phpbb', $twig_extension);
+
+		$twig_extensions_collection = new \phpbb\di\service_collection($phpbb_container);
+		$twig_extensions_collection->add('template.twig.extensions.phpbb');
+		$phpbb_container->set('template.twig.extensions.collection', $twig_extensions_collection);
+
 		$twig = new \phpbb\template\twig\environment(
 			$config,
 			$filesystem,
diff --git a/tests/extension/metadata_manager_test.php b/tests/extension/metadata_manager_test.php
index a2f0542979..f2f5dc669e 100644
--- a/tests/extension/metadata_manager_test.php
+++ b/tests/extension/metadata_manager_test.php
@@ -36,6 +36,8 @@ class phpbb_extension_metadata_manager_test extends phpbb_database_test_case
 	{
 		parent::setUp();
 
+		$auth = $this->getMock('\phpbb\auth\auth');
+
 		$this->config = new \phpbb\config\config(array(
 			'version'		=> '3.1.0',
 		));
@@ -111,7 +113,7 @@ class phpbb_extension_metadata_manager_test extends phpbb_database_test_case
 		$lang = new \phpbb\language\language($lang_loader);
 		$this->user = new \phpbb\user($lang, '\phpbb\datetime');
 
-		$this->template = new phpbb\template\twig\twig($phpbb_path_helper, $this->config, $context, $twig, $cache_path, $this->user, array(new \phpbb\template\twig\extension($context, $twig, $this->user)));
+		$this->template = new phpbb\template\twig\twig($phpbb_path_helper, $this->config, $context, $twig, $cache_path, $this->user, array(new \phpbb\template\twig\extension($auth, $context, $twig, $this->user)));
 		$twig->setLexer(new \phpbb\template\twig\lexer($twig));
 	}
 
diff --git a/tests/template/template_allfolder_test.php b/tests/template/template_allfolder_test.php
index a9a8ecc287..60891a3668 100644
--- a/tests/template/template_allfolder_test.php
+++ b/tests/template/template_allfolder_test.php
@@ -26,6 +26,8 @@ class phpbb_template_allfolder_test extends phpbb_template_template_test_case
 	{
 		global $phpbb_root_path, $phpEx;
 
+		$auth = $this->getMock('\phpbb\auth\auth');
+
 		$defaults = $this->config_defaults();
 		$config = new \phpbb\config\config(array_merge($defaults, $new_config));
 		$lang_loader = new \phpbb\language\language_file_loader($phpbb_root_path, $phpEx);
@@ -75,7 +77,7 @@ class phpbb_template_allfolder_test extends phpbb_template_template_test_case
 				'autoescape'	=> false,
 			)
 		);
-		$this->template = new \phpbb\template\twig\twig($path_helper, $config, $context, $twig, $cache_path, $this->user, array(new \phpbb\template\twig\extension($context, $twig, $this->user)), $this->extension_manager);
+		$this->template = new \phpbb\template\twig\twig($path_helper, $config, $context, $twig, $cache_path, $this->user, array(new \phpbb\template\twig\extension($auth, $context, $twig, $this->user)), $this->extension_manager);
 		$twig->setLexer(new \phpbb\template\twig\lexer($twig));
 
 		$this->template_path = $this->test_path . '/templates';
diff --git a/tests/template/template_events_test.php b/tests/template/template_events_test.php
index 9243390937..e879979803 100644
--- a/tests/template/template_events_test.php
+++ b/tests/template/template_events_test.php
@@ -131,6 +131,8 @@ Zeta test event in all',
 	{
 		global $phpbb_root_path, $phpEx, $user;
 
+		$auth = $this->getMock('\phpbb\auth\auth');
+
 		$defaults = $this->config_defaults();
 		$config = new \phpbb\config\config(array_merge($defaults, $new_config));
 
@@ -169,7 +171,7 @@ Zeta test event in all',
 				'autoescape'	=> false,
 			)
 		);
-		$this->template = new \phpbb\template\twig\twig($path_helper, $config, $context, $twig, $cache_path, $this->user, array(new \phpbb\template\twig\extension($context, $twig, $this->user)), $this->extension_manager);
+		$this->template = new \phpbb\template\twig\twig($path_helper, $config, $context, $twig, $cache_path, $this->user, array(new \phpbb\template\twig\extension($auth, $context, $twig, $this->user)), $this->extension_manager);
 		$twig->setLexer(new \phpbb\template\twig\lexer($twig));
 
 		$this->template->set_custom_style(((!empty($style_names)) ? $style_names : 'silver'), array($this->template_path));
diff --git a/tests/template/template_includecss_test.php b/tests/template/template_includecss_test.php
index 5f9875a556..0f26c095a7 100644
--- a/tests/template/template_includecss_test.php
+++ b/tests/template/template_includecss_test.php
@@ -25,6 +25,8 @@ class phpbb_template_template_includecss_test extends phpbb_template_template_te
 	{
 		global $phpbb_root_path, $phpEx, $user;
 
+		$auth = $this->getMock('\phpbb\auth\auth');
+
 		$defaults = $this->config_defaults();
 		$config = new \phpbb\config\config(array_merge($defaults, $new_config));
 
@@ -68,7 +70,7 @@ class phpbb_template_template_includecss_test extends phpbb_template_template_te
 			$twig,
 			$cache_path,
 			$this->user,
-			array(new \phpbb\template\twig\extension($context, $twig, $this->user)),
+			array(new \phpbb\template\twig\extension($auth, $context, $twig, $this->user)),
 			new phpbb_mock_extension_manager(
 				dirname(__FILE__) . '/',
 				array(
diff --git a/tests/template/template_test_case.php b/tests/template/template_test_case.php
index 0389088ec8..f495c93f9d 100644
--- a/tests/template/template_test_case.php
+++ b/tests/template/template_test_case.php
@@ -73,6 +73,8 @@ class phpbb_template_template_test_case extends phpbb_test_case
 	{
 		global $phpbb_root_path, $phpEx;
 
+		$auth = $this->getMock('\phpbb\auth\auth');
+
 		$defaults = $this->config_defaults();
 		$config = new \phpbb\config\config(array_merge($defaults, $new_config));
 		$lang_loader = new \phpbb\language\language_file_loader($phpbb_root_path, $phpEx);
@@ -113,7 +115,7 @@ class phpbb_template_template_test_case extends phpbb_test_case
 				'autoescape'	=> false,
 			)
 		);
-		$this->template = new phpbb\template\twig\twig($path_helper, $config, $context, $twig, $cache_path, $this->user, array(new \phpbb\template\twig\extension($context, $twig, $this->user)));
+		$this->template = new phpbb\template\twig\twig($path_helper, $config, $context, $twig, $cache_path, $this->user, array(new \phpbb\template\twig\extension($auth, $context, $twig, $this->user)));
 		$twig->setLexer(new \phpbb\template\twig\lexer($twig));
 		$this->template->set_custom_style('tests', $this->template_path);
 	}
diff --git a/tests/template/template_test_case_with_tree.php b/tests/template/template_test_case_with_tree.php
index c0238b6f03..756bedb042 100644
--- a/tests/template/template_test_case_with_tree.php
+++ b/tests/template/template_test_case_with_tree.php
@@ -19,6 +19,8 @@ class phpbb_template_template_test_case_with_tree extends phpbb_template_templat
 	{
 		global $phpbb_root_path, $phpEx, $user;
 
+		$auth = $this->getMock('\phpbb\auth\auth');
+
 		$defaults = $this->config_defaults();
 		$config = new \phpbb\config\config(array_merge($defaults, $new_config));
 
@@ -56,7 +58,7 @@ class phpbb_template_template_test_case_with_tree extends phpbb_template_templat
 				'autoescape'	=> false,
 			)
 		);
-		$this->template = new phpbb\template\twig\twig($this->phpbb_path_helper, $config, $context, $twig, $cache_path, $this->user, array(new \phpbb\template\twig\extension($context, $twig, $this->user)));
+		$this->template = new phpbb\template\twig\twig($this->phpbb_path_helper, $config, $context, $twig, $cache_path, $this->user, array(new \phpbb\template\twig\extension($auth, $context, $twig, $this->user)));
 		$twig->setLexer(new \phpbb\template\twig\lexer($twig));
 		$this->template->set_custom_style('tests', array($this->template_path, $this->parent_template_path));
 	}