diff --git a/src/fib.ts b/src/fib.ts
index 0d292e9..b060f7c 100644
--- a/src/fib.ts
+++ b/src/fib.ts
@@ -1,8 +1,8 @@
 // util function that computes the fibonacci numbers
-export default function fibonacci(n) {
-  if (n < 0) {
+export default function fibonacci(n: number):number {
+  if (n < 0) 
     return -1;
-  } else if (n == 0) {
+  else if (n == 0) {
     return 0;
   } else if (n == 1) {
     return 1;
@@ -10,3 +10,5 @@ export default function fibonacci(n) {
 
   return fibonacci(n - 1) + fibonacci(n - 2);
 }
+
+
diff --git a/src/fibRoute.ts b/src/fibRoute.ts
index e4fa96e..0c24099 100644
--- a/src/fibRoute.ts
+++ b/src/fibRoute.ts
@@ -1,8 +1,10 @@
 // Endpoint for querying the fibonacci numbers
 
+import * as express from 'express';
+import {Request, Response} from 'express';
 import fibonacci from "./fib";
 
-export default (req, res) => {
+export default (req: Request, res: Response) => {
   const { num } = req.params;
 
   const fibN = fibonacci(parseInt(num));