diff --git a/countdown/countdown.d.ts b/countdown/countdown.d.ts
index dd604a36f8..5b40541dd0 100644
--- a/countdown/countdown.d.ts
+++ b/countdown/countdown.d.ts
@@ -65,5 +65,5 @@ declare module 'countdown' {
       setFormat(format: Format): void;
   }
 
-  export var countdown: CountdownStatic;
+  export let countdown: CountdownStatic;
 }