diff --git a/lib/types.ts b/lib/types.ts
index 37b25ba..835c301 100644
--- a/lib/types.ts
+++ b/lib/types.ts
@@ -1,4 +1,5 @@
 import { ExtendedRecordMap, PageMap } from 'notion-types'
+import { ParsedUrlQuery } from 'querystring'
 
 export * from 'notion-types'
 
@@ -16,6 +17,10 @@ export interface PageProps {
   error?: PageError
 }
 
+export interface Params extends ParsedUrlQuery {
+  pageId: string
+}
+
 export interface Site {
   name: string
   domain: string
diff --git a/pages/[pageId].tsx b/pages/[pageId].tsx
index b92d68b..b9d573f 100644
--- a/pages/[pageId].tsx
+++ b/pages/[pageId].tsx
@@ -1,10 +1,12 @@
 import * as React from 'react'
+import { GetStaticProps } from 'next'
 import { isDev, domain } from 'lib/config'
 import { getSiteMap } from 'lib/get-site-map'
 import { resolveNotionPage } from 'lib/resolve-notion-page'
+import { PageProps, Params } from 'lib/types'
 import { NotionPage } from 'components'
 
-export const getStaticProps = async (context) => {
+export const getStaticProps: GetStaticProps<PageProps, Params> = async (context) => {
   const rawPageId = context.params.pageId as string
 
   try {