diff --git a/src/fibRoute.ts b/src/fibRoute.ts
index 91dbb97..79a1706 100644
--- a/src/fibRoute.ts
+++ b/src/fibRoute.ts
@@ -4,9 +4,9 @@ import { Request, Response } from "express";
 import fibonacci from "./fib";
 
 export default (req: Request, res: Response): void => {
-  const { num } = req.params;
+  const num = req.params.num;
 
-  const fibN = fibonacci(parseInt(num));
+  const fibN: number = fibonacci(parseInt(num, 10));
   let result = `fibonacci(${num}) is ${fibN}`;
 
   if (fibN < 0) {