diff --git a/phpBB/common.php b/phpBB/common.php
index 406d8bb093..f958f06ce0 100644
--- a/phpBB/common.php
+++ b/phpBB/common.php
@@ -9,7 +9,6 @@
 */
 
 use Symfony\Component\Config\FileLocator;
-use Symfony\Component\DependencyInjection\Compiler\Compiler;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
 
@@ -102,6 +101,12 @@ $processor->process($phpbb_container);
 $phpbb_class_loader = $phpbb_container->get('class_loader');
 $phpbb_class_loader_ext = $phpbb_container->get('class_loader.ext');
 
+$ids = array_keys($phpbb_container->findTaggedServiceIds('container.processor'));
+foreach ($ids as $id) {
+	$processor = $phpbb_container->get($id);
+	$processor->process($phpbb_container);
+}
+
 // set up caching
 $cache = $phpbb_container->get('cache');
 
diff --git a/phpBB/config/services.yml b/phpBB/config/services.yml
index 20f9d67dd0..61497cbcc1 100644
--- a/phpBB/config/services.yml
+++ b/phpBB/config/services.yml
@@ -126,3 +126,10 @@ services:
             - cron_lock
             - @config
             - @dbal.conn
+
+    processor.config:
+        class: phpbb_di_processor_ext
+        arguments:
+            - @ext.manager
+        tags:
+            - { name: container.processor }
diff --git a/phpBB/download/file.php b/phpBB/download/file.php
index d8fec8ef94..656f1f38d6 100644
--- a/phpBB/download/file.php
+++ b/phpBB/download/file.php
@@ -8,7 +8,6 @@
 */
 
 use Symfony\Component\Config\FileLocator;
-use Symfony\Component\DependencyInjection\Compiler\Compiler;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
 
@@ -62,6 +61,12 @@ if (isset($_GET['avatar']))
 	$phpbb_class_loader = $phpbb_container->get('class_loader');
 	$phpbb_class_loader_ext = $phpbb_container->get('class_loader.ext');
 
+	$ids = array_keys($phpbb_container->findTaggedServiceIds('container.processor'));
+	foreach ($ids as $id) {
+		$processor = $phpbb_container->get($id);
+		$processor->process($phpbb_container);
+	}
+
 	// set up caching
 	$cache = $phpbb_container->get('cache');
 
diff --git a/phpBB/includes/di/processor/ext.php b/phpBB/includes/di/processor/ext.php
new file mode 100644
index 0000000000..b39ba5e686
--- /dev/null
+++ b/phpBB/includes/di/processor/ext.php
@@ -0,0 +1,41 @@
+<?php
+/**
+*
+* @package phpBB3
+* @copyright (c) 2012 phpBB Group
+* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
+*
+*/
+
+/**
+* @ignore
+*/
+if (!defined('IN_PHPBB'))
+{
+    exit;
+}
+
+use Symfony\Component\Config\FileLocator;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
+
+class phpbb_di_processor_ext implements phpbb_di_processor_interface
+{
+    private $extension_manager;
+
+    public function __construct($extension_manager)
+    {
+        $this->extension_manager = $extension_manager;
+    }
+
+    public function process(ContainerBuilder $container)
+    {
+        $enabled_exts = $this->extension_manager->all_enabled();
+        foreach ($enabled_exts as $name => $path) {
+            if (file_exists($path . '/config/services.yml')) {
+                $loader = new YamlFileLoader($container, new FileLocator($path . '/config'));
+                $loader->load('services.yml');
+            }
+        }
+    }
+}
diff --git a/phpBB/install/index.php b/phpBB/install/index.php
index 0e298c8cdc..1ba0798abc 100644
--- a/phpBB/install/index.php
+++ b/phpBB/install/index.php
@@ -8,7 +8,6 @@
 */
 
 use Symfony\Component\Config\FileLocator;
-use Symfony\Component\DependencyInjection\Compiler\Compiler;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
 
@@ -99,6 +98,12 @@ $phpbb_container->setAlias('cache.driver.install', 'cache.driver');
 $phpbb_class_loader = $phpbb_container->get('class_loader');
 $phpbb_class_loader_ext = $phpbb_container->get('class_loader.ext');
 
+$ids = array_keys($phpbb_container->findTaggedServiceIds('container.processor'));
+foreach ($ids as $id) {
+	$processor = $phpbb_container->get($id);
+	$processor->process($phpbb_container);
+}
+
 // set up caching
 $cache = $phpbb_container->get('cache');