diff --git a/packages/next/client/components/not-found.ts b/packages/next/client/components/not-found.ts
index e5cad6a30139412..2ca5e894be9bbfa 100644
--- a/packages/next/client/components/not-found.ts
+++ b/packages/next/client/components/not-found.ts
@@ -1,6 +1,6 @@
 export const NOT_FOUND_ERROR_CODE = 'NEXT_NOT_FOUND'
 
-export function notFound() {
+export function notFound(): never {
   // eslint-disable-next-line no-throw-literal
   const error = new Error(NOT_FOUND_ERROR_CODE)
   ;(error as any).digest = NOT_FOUND_ERROR_CODE
diff --git a/packages/next/client/components/redirect.ts b/packages/next/client/components/redirect.ts
index 0b500ae87256f3f..5e685f94edbe0d9 100644
--- a/packages/next/client/components/redirect.ts
+++ b/packages/next/client/components/redirect.ts
@@ -1,6 +1,6 @@
 export const REDIRECT_ERROR_CODE = 'NEXT_REDIRECT'
 
-export function redirect(url: string) {
+export function redirect(url: string): never {
   // eslint-disable-next-line no-throw-literal
   const error = new Error(REDIRECT_ERROR_CODE)
   ;(error as any).digest = REDIRECT_ERROR_CODE + ';' + url