diff --git a/types/mirrorx/index.d.ts b/types/mirrorx/index.d.ts
index 2c07f1008b..4c1da1e750 100644
--- a/types/mirrorx/index.d.ts
+++ b/types/mirrorx/index.d.ts
@@ -2,7 +2,7 @@
 // Project: https://github.com/mirrorjs/mirror
 // Definitions by: Aaronphy <https://github.com/aaronphy>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-// TypeScript Version:  2.6
+// TypeScript Version:  1.9
 
 import * as React from 'react';
 import * as H from 'history';