diff --git a/lib/session.ts b/lib/session.ts
index 202b228..bd6ac70 100644
--- a/lib/session.ts
+++ b/lib/session.ts
@@ -1,9 +1,9 @@
-import { withIronSession } from 'next-iron-session'
+import { withIronSession, Handler } from 'next-iron-session'
 
 const SESSION_SECRET =
   process.env.SESSION_SECRET || 'dev-env-default-secret-991823723'
 
-export default function withSession(handler) {
+export default function withSession(handler: Handler) {
   return withIronSession(handler, {
     password: SESSION_SECRET,
     cookieName: 'pfadi-bussle-cookie',