diff --git a/lib/controller.js b/lib/controller.js
index fe368afd..3b93b910 100644
--- a/lib/controller.js
+++ b/lib/controller.js
@@ -74,7 +74,7 @@ class Controller {
 
         const extensionPath = data.joinPath('extension');
         if (fs.existsSync(extensionPath)) {
-            const extensions = fs.readdirSync(extensionPath);
+            const extensions = fs.readdirSync(extensionPath).filter((f) => f.endsWith('.js'));
             for (const extension of extensions) {
                 const Extension = require(path.join(extensionPath, extension.split('.')[0]));
                 this.extensions.push(new Extension(...args, logger));