diff --git a/jquery.tinycarousel/jquery.tinycarousel.d.ts b/jquery.tinycarousel/jquery.tinycarousel.d.ts
index 83a0301079..2f4f4563a9 100644
--- a/jquery.tinycarousel/jquery.tinycarousel.d.ts
+++ b/jquery.tinycarousel/jquery.tinycarousel.d.ts
@@ -50,7 +50,7 @@ declare module JQueryTinyCarousel {
         /**
         * Function that executes after every move (default: null)
         */
-        callback? : Function;
+        callback? : (element: HTMLElement, index: number) => void;
     }
 }
 interface JQuery {