diff --git a/phpBB/config/auth_providers.yml b/phpBB/config/auth_providers.yml
index cc782376fc..e1c289334e 100644
--- a/phpBB/config/auth_providers.yml
+++ b/phpBB/config/auth_providers.yml
@@ -36,7 +36,7 @@ services:
         tags:
             - { name: auth.provider }
     auth.provider.oauth:
-        class: phpbb_auth_provider_oauth
+        class: phpbb\auth\provider\oauth\oauth
         arguments:
             - @dbal.conn
             - @config
@@ -51,27 +51,27 @@ services:
         tags:
             - { name: auth.provider }
     auth.provider.oauth.service_collection:
-        class: phpbb_di_service_collection
+        class: phpbb\di\service_collection
         arguments:
             - @service_container
         tags:
             - { name: service_collection, tag: auth.provider.oauth.service }
     auth.provider.oauth.service.bitly:
-        class: phpbb_auth_provider_oauth_service_bitly
+        class: phpbb\auth\provider\oauth\service\bitly
         arguments:
             - @config
             - @request
         tags:
             - { name: auth.provider.oauth.service }
     auth.provider.oauth.service.facebook:
-        class: phpbb_auth_provider_oauth_service_facebook
+        class: phpbb\auth\provider\oauth\service\facebook
         arguments:
             - @config
             - @request
         tags:
             - { name: auth.provider.oauth.service }
     auth.provider.oauth.service.google:
-        class: phpbb_auth_provider_oauth_service_google
+        class: phpbb\auth\provider\oauth\service\google
         arguments:
             - @config
             - @request
diff --git a/phpBB/phpbb/auth/provider/oauth/oauth.php b/phpBB/phpbb/auth/provider/oauth/oauth.php
index e92462b344..de81ac0d04 100644
--- a/phpBB/phpbb/auth/provider/oauth/oauth.php
+++ b/phpBB/phpbb/auth/provider/oauth/oauth.php
@@ -30,7 +30,7 @@ class oauth extends \phpbb\auth\provider\base
 	/**
 	* Database driver
 	*
-	* @var \phpbb\db\driver
+	* @var \phpbb\db\driver\driver
 	*/
 	protected $db;
 
@@ -107,7 +107,7 @@ class oauth extends \phpbb\auth\provider\base
 	/**
 	* OAuth Authentication Constructor
 	*
-	* @param	\phpbb\db\driver	$db
+	* @param	\phpbb\db\driver\driver	$db
 	* @param	\phpbb\config\config	$config
 	* @param	\phpbb\request\request_interface	$request
 	* @param	\phpbb\user		$user
@@ -118,7 +118,7 @@ class oauth extends \phpbb\auth\provider\base
 	* @param	string			$phpbb_root_path
 	* @param	string			$php_ext
 	*/
-	public function __construct(\phpbb\db\driver $db, \phpbb\config\config $config, \phpbb\request\request_interface $request, \phpbb\user $user, $auth_provider_oauth_token_storage_table, $auth_provider_oauth_token_account_assoc, \phpbb\di\service_collection $service_providers, $users_table, $phpbb_root_path, $php_ext)
+	public function __construct(\phpbb\db\driver\driver $db, \phpbb\config\config $config, \phpbb\request\request_interface $request, \phpbb\user $user, $auth_provider_oauth_token_storage_table, $auth_provider_oauth_token_account_assoc, \phpbb\di\service_collection $service_providers, $users_table, $phpbb_root_path, $php_ext)
 	{
 		$this->db = $db;
 		$this->config = $config;
diff --git a/phpBB/phpbb/auth/provider/oauth/service/base.php b/phpBB/phpbb/auth/provider/oauth/service/base.php
index 1eb49b4265..61deb48695 100644
--- a/phpBB/phpbb/auth/provider/oauth/service/base.php
+++ b/phpBB/phpbb/auth/provider/oauth/service/base.php
@@ -7,6 +7,8 @@
 *
 */
 
+namespace phpbb\auth\provider\oauth\service;
+
 /**
 * @ignore
 */
@@ -20,7 +22,7 @@ if (!defined('IN_PHPBB'))
 *
 * @package auth
 */
-abstract class phpbb_auth_provider_oauth_service_base implements phpbb_auth_provider_oauth_service_interface
+abstract class base implements \phpbb\auth\provider\oauth\service\service_interface
 {
 	/**
 	* External OAuth service provider
diff --git a/phpBB/phpbb/auth/provider/oauth/service/facebook.php b/phpBB/phpbb/auth/provider/oauth/service/facebook.php
index 49206b7654..4a4eeba6d5 100644
--- a/phpBB/phpbb/auth/provider/oauth/service/facebook.php
+++ b/phpBB/phpbb/auth/provider/oauth/service/facebook.php
@@ -7,6 +7,8 @@
 *
 */
 
+namespace phpbb\auth\provider\oauth\service;
+
 /**
 * @ignore
 */
@@ -20,29 +22,29 @@ if (!defined('IN_PHPBB'))
 *
 * @package auth
 */
-class phpbb_auth_provider_oauth_service_facebook extends phpbb_auth_provider_oauth_service_base
+class facebook extends base
 {
 	/**
 	* phpBB config
 	*
-	* @var phpbb_config
+	* @var phpbb\config\config
 	*/
 	protected $config;
 
 	/**
 	* phpBB request
 	*
-	* @var phpbb_request
+	* @var phpbb\request\request_interface
 	*/
 	protected $request;
 
 	/**
 	* Constructor
 	*
-	* @param	phpbb_config 	$config
-	* @param	phpbb_request 	$request
+	* @param	phpbb\config\config					$config
+	* @param	phpbb\request\request_interface 	$request
 	*/
-	public function __construct(phpbb_config $config, phpbb_request $request)
+	public function __construct(\phpbb\config\config $config, \phpbb\request\request_interface $request)
 	{
 		$this->config = $config;
 		$this->request = $request;
@@ -66,7 +68,7 @@ class phpbb_auth_provider_oauth_service_facebook extends phpbb_auth_provider_oau
 	{
 		if (!($this->service_provider instanceof \OAuth\OAuth2\Service\Facebook))
 		{
-			throw new phpbb_auth_provider_oauth_service_exception('AUTH_PROVIDER_OAUTH_ERROR_INVALID_SERVICE_TYPE');
+			throw new exception('AUTH_PROVIDER_OAUTH_ERROR_INVALID_SERVICE_TYPE');
 		}
 
 		// This was a callback request, get the token
@@ -86,7 +88,7 @@ class phpbb_auth_provider_oauth_service_facebook extends phpbb_auth_provider_oau
 	{
 		if (!($this->service_provider instanceof \OAuth\OAuth2\Service\Facebook))
 		{
-			throw new phpbb_auth_provider_oauth_service_exception('AUTH_PROVIDER_OAUTH_ERROR_INVALID_SERVICE_TYPE');
+			throw new exception('AUTH_PROVIDER_OAUTH_ERROR_INVALID_SERVICE_TYPE');
 		}
 
 		// Send a request with it
diff --git a/phpBB/phpbb/auth/provider/oauth/service/google.php b/phpBB/phpbb/auth/provider/oauth/service/google.php
index d4ef6e1d42..2449bbf523 100644
--- a/phpBB/phpbb/auth/provider/oauth/service/google.php
+++ b/phpBB/phpbb/auth/provider/oauth/service/google.php
@@ -7,6 +7,8 @@
 *
 */
 
+namespace phpbb\auth\provider\oauth\service;
+
 /**
 * @ignore
 */
@@ -20,29 +22,29 @@ if (!defined('IN_PHPBB'))
 *
 * @package auth
 */
-class phpbb_auth_provider_oauth_service_google extends phpbb_auth_provider_oauth_service_base
+class google extends base
 {
 	/**
 	* phpBB config
 	*
-	* @var phpbb_config
+	* @var phpbb\config\config
 	*/
 	protected $config;
 
 	/**
 	* phpBB request
 	*
-	* @var phpbb_request
+	* @var phpbb\request\request_interface
 	*/
 	protected $request;
 
 	/**
 	* Constructor
 	*
-	* @param	phpbb_config 	$config
-	* @param	phpbb_request 	$request
+	* @param	phpbb\config\config					$config
+	* @param	phpbb\request\request_interface 	$request
 	*/
-	public function __construct(phpbb_config $config, phpbb_request $request)
+	public function __construct(\phpbb\config\config $config, \phpbb\request\request_interface $request)
 	{
 		$this->config = $config;
 		$this->request = $request;
@@ -77,7 +79,7 @@ class phpbb_auth_provider_oauth_service_google extends phpbb_auth_provider_oauth
 	{
 		if (!($this->service_provider instanceof \OAuth\OAuth2\Service\Google))
 		{
-			throw new phpbb_auth_provider_oauth_service_exception('AUTH_PROVIDER_OAUTH_ERROR_INVALID_SERVICE_TYPE');
+			throw new exception('AUTH_PROVIDER_OAUTH_ERROR_INVALID_SERVICE_TYPE');
 		}
 
 		// This was a callback request, get the token
@@ -97,7 +99,7 @@ class phpbb_auth_provider_oauth_service_google extends phpbb_auth_provider_oauth
 	{
 		if (!($this->service_provider instanceof \OAuth\OAuth2\Service\Google))
 		{
-			throw new phpbb_auth_provider_oauth_service_exception('AUTH_PROVIDER_OAUTH_ERROR_INVALID_SERVICE_TYPE');
+			throw new exception('AUTH_PROVIDER_OAUTH_ERROR_INVALID_SERVICE_TYPE');
 		}
 
 		// Send a request with it
diff --git a/phpBB/phpbb/auth/provider/oauth/service/interface.php b/phpBB/phpbb/auth/provider/oauth/service/service_interface.php
similarity index 90%
rename from phpBB/phpbb/auth/provider/oauth/service/interface.php
rename to phpBB/phpbb/auth/provider/oauth/service/service_interface.php
index 3bba7c0e2c..ab69fe6ef3 100644
--- a/phpBB/phpbb/auth/provider/oauth/service/interface.php
+++ b/phpBB/phpbb/auth/provider/oauth/service/service_interface.php
@@ -7,6 +7,8 @@
 *
 */
 
+namespace phpbb\auth\provider\oauth\service;
+
 /**
 * @ignore
 */
@@ -20,7 +22,7 @@ if (!defined('IN_PHPBB'))
 *
 * @package auth
 */
-interface phpbb_auth_provider_oauth_service_interface
+interface service_interface
 {
 	/**
 	* Returns an array of the scopes necessary for auth
@@ -52,7 +54,7 @@ interface phpbb_auth_provider_oauth_service_interface
 	/**
 	* Returns the results of the authentication in json format
 	*
-	* @throws	phpbb_auth_provider_oauth_service_exception
+	* @throws	\phpbb\auth\provider\oauth\service\exception
 	* @return	string	The unique identifier returned by the service provider
 	*					that is used to authenticate the user with phpBB.
 	*/
@@ -62,7 +64,7 @@ interface phpbb_auth_provider_oauth_service_interface
 	* Returns the results of the authentication in json format
 	* Use this function when the user already has an access token
 	*
-	* @throws	phpbb_auth_provider_oauth_service_exception
+	* @throws	\phpbb\auth\provider\oauth\service\exception
 	* @return	string	The unique identifier returned by the service provider
 	*					that is used to authenticate the user with phpBB.
 	*/