diff --git a/src/RecipePlugin.php b/src/RecipePlugin.php
index d16edbd..b4184ce 100644
--- a/src/RecipePlugin.php
+++ b/src/RecipePlugin.php
@@ -96,8 +96,8 @@ public function cleanupProject(Event $event)
         $data = $file->read();
 
         // Remove project and public files from project
-        unset($data['extra'][self::PROJECT_FILES]);
-        unset($data['extra'][self::PUBLIC_FILES]);
+        unset($data['extra'][RecipePlugin::PROJECT_FILES]);
+        unset($data['extra'][RecipePlugin::PUBLIC_FILES]);
 
         // Remove redundant empty extra
         if (empty($data['extra'])) {