diff --git a/phpBB/includes/template/twig/environment.php b/phpBB/includes/template/twig/environment.php
index f1ce6da38b..73375444da 100644
--- a/phpBB/includes/template/twig/environment.php
+++ b/phpBB/includes/template/twig/environment.php
@@ -132,7 +132,7 @@ class phpbb_template_twig_environment extends Twig_Environment
 	{
 		if (strpos($name, '@') === false)
 		{
-			foreach ($this->namespaceLookUpOrder as $namespace)
+			foreach ($this->getNamespaceLookUpOrder() as $namespace)
 			{
 				try
 				{