diff --git a/phpBB/includes/template/extension_path_provider.php b/phpBB/includes/template/extension_path_provider.php
index 0cef590baa..67f0dd48c1 100644
--- a/phpBB/includes/template/extension_path_provider.php
+++ b/phpBB/includes/template/extension_path_provider.php
@@ -96,6 +96,7 @@ class phpbb_template_extension_path_provider extends phpbb_extension_provider im
 	public function set_templates(array $templates)
 	{
 		$this->base_paths->set_templates($templates);
+		$this->items = null;
 	}
 
 	/**