diff --git a/phpBB/config/services.yml b/phpBB/config/services.yml
index 502a3c418f..949f89b946 100644
--- a/phpBB/config/services.yml
+++ b/phpBB/config/services.yml
@@ -70,7 +70,7 @@ services:
             - @template
             - @user
             - %core.root_path%
-            - .%core.php_ext%
+            - %core.php_ext%
 
     controller.resolver:
         class: phpbb_controller_resolver
diff --git a/phpBB/includes/controller/helper.php b/phpBB/includes/controller/helper.php
index 46c6307cb4..74410ddfd1 100644
--- a/phpBB/includes/controller/helper.php
+++ b/phpBB/includes/controller/helper.php
@@ -117,7 +117,7 @@ class phpbb_controller_helper
 			$params = array('controller' => $route);
 		}
 
-		return append_sid($this->phpbb_root_path . 'app' . $this->php_ext . $route_params, $params, $is_amp, $session_id);
+		return append_sid($this->phpbb_root_path . 'app.' . $this->php_ext . $route_params, $params, $is_amp, $session_id);
 	}
 
 	/**