diff --git a/index.d.ts b/index.d.ts
index c33765c..d277045 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -1 +1,7 @@
 export default class TabContainerElement extends HTMLElement { }
+
+declare global {
+  interface Window {
+    TabContainerElement: typeof TabContainerElement
+  }
+}