diff --git a/phpBB/phpbb/di/service_collection/ordered_service_collection.php b/phpBB/phpbb/di/service_collection/ordered_service_collection.php
index 01d0914ad4..f012abcd09 100644
--- a/phpBB/phpbb/di/service_collection/ordered_service_collection.php
+++ b/phpBB/phpbb/di/service_collection/ordered_service_collection.php
@@ -43,6 +43,19 @@ class ordered_service_collection extends service_collection
 		parent::__construct($container);
 	}
 
+	/**
+	 * {@inheritdoc}
+	 */
+	public function getIterator()
+	{
+		if (!$this->is_ordered)
+		{
+			$this->sort_services();
+		}
+
+		return new service_collection_iterator($this);
+	}
+
 	/**
 	 * {@inheritdoc}
 	 */