diff --git a/src/middlewares/callHandler.ts b/src/middlewares/callHandler.ts
index aa316275..74f529a2 100644
--- a/src/middlewares/callHandler.ts
+++ b/src/middlewares/callHandler.ts
@@ -1,7 +1,7 @@
 import { QContext } from "../../index";
 import { undefinedOrTrue } from "../utils";
 
-export default function callHandler(context: QContext, done) {
+export default function callHandler(context: QContext, done: () => void) {
   if (undefinedOrTrue(context.navigateOptions, "callHandler")) {
     context.match.route.handler(context.match);
   }