diff --git a/packages/next/server/base-server.ts b/packages/next/server/base-server.ts
index a575e1ad59696..5168da0997e9b 100644
--- a/packages/next/server/base-server.ts
+++ b/packages/next/server/base-server.ts
@@ -1323,6 +1323,10 @@ export default abstract class Server {
           return seg
         })
         .join('/')
+
+      // ensure /index and / is normalized to one key
+      ssgCacheKey =
+        ssgCacheKey === '/index' && pathname === '/' ? '/' : ssgCacheKey
     }
 
     const doRender: () => Promise<ResponseCacheEntry | null> = async () => {
diff --git a/test/production/required-server-files-i18n.test.ts b/test/production/required-server-files-i18n.test.ts
index 43303acf24854..b74cd9bd9f0d4 100644
--- a/test/production/required-server-files-i18n.test.ts
+++ b/test/production/required-server-files-i18n.test.ts
@@ -162,6 +162,8 @@ describe('should set-up next', () => {
     const res2 = await fetchViaHTTP(appPort, '/gssp', undefined, {
       redirect: 'manual ',
     })
+    await next.patchFile('standalone/data.txt', 'show')
+
     expect(res2.status).toBe(404)
     expect(res2.headers.get('cache-control')).toBe(
       's-maxage=1, stale-while-revalidate'
@@ -169,18 +171,18 @@ describe('should set-up next', () => {
   })
 
   it('should render SSR page correctly', async () => {
-    const html = await renderViaHTTP(appPort, '/')
+    const html = await renderViaHTTP(appPort, '/gssp')
     const $ = cheerio.load(html)
     const data = JSON.parse($('#props').text())
 
-    expect($('#index').text()).toBe('index page')
+    expect($('#gssp').text()).toBe('getServerSideProps page')
     expect(data.hello).toBe('world')
 
-    const html2 = await renderViaHTTP(appPort, '/')
+    const html2 = await renderViaHTTP(appPort, '/gssp')
     const $2 = cheerio.load(html2)
     const data2 = JSON.parse($2('#props').text())
 
-    expect($2('#index').text()).toBe('index page')
+    expect($2('#gssp').text()).toBe('getServerSideProps page')
     expect(isNaN(data2.random)).toBe(false)
     expect(data2.random).not.toBe(data.random)
   })
@@ -244,24 +246,24 @@ describe('should set-up next', () => {
   it('should render SSR page correctly with x-matched-path', async () => {
     const html = await renderViaHTTP(appPort, '/some-other-path', undefined, {
       headers: {
-        'x-matched-path': '/',
+        'x-matched-path': '/gssp',
       },
     })
     const $ = cheerio.load(html)
     const data = JSON.parse($('#props').text())
 
-    expect($('#index').text()).toBe('index page')
+    expect($('#gssp').text()).toBe('getServerSideProps page')
     expect(data.hello).toBe('world')
 
     const html2 = await renderViaHTTP(appPort, '/some-other-path', undefined, {
       headers: {
-        'x-matched-path': '/',
+        'x-matched-path': '/gssp',
       },
     })
     const $2 = cheerio.load(html2)
     const data2 = JSON.parse($2('#props').text())
 
-    expect($2('#index').text()).toBe('index page')
+    expect($2('#gssp').text()).toBe('getServerSideProps page')
     expect(isNaN(data2.random)).toBe(false)
     expect(data2.random).not.toBe(data.random)
   })
@@ -508,7 +510,7 @@ describe('should set-up next', () => {
       },
       {
         headers: {
-          'x-matched-path': '/',
+          'x-matched-path': '/gssp',
         },
       }
     )
diff --git a/test/production/required-server-files.test.ts b/test/production/required-server-files.test.ts
index 4f8eb6969c6cc..010f7dbbf8586 100644
--- a/test/production/required-server-files.test.ts
+++ b/test/production/required-server-files.test.ts
@@ -176,6 +176,29 @@ describe('should set-up next', () => {
     expect(res2.status).toBe(200)
     const { pageProps: props2 } = await res2.json()
     expect(props2.gspCalls).toBe(props.gspCalls)
+
+    const res3 = await fetchViaHTTP(appPort, '/index', undefined, {
+      redirect: 'manual',
+      headers: {
+        'x-matched-path': '/index',
+      },
+    })
+    expect(res3.status).toBe(200)
+    const $2 = cheerio.load(await res3.text())
+    const props3 = JSON.parse($2('#props').text())
+    expect(props3.gspCalls).toBeDefined()
+
+    const res4 = await fetchViaHTTP(
+      appPort,
+      `/_next/data/${next.buildId}/index.json`,
+      undefined,
+      {
+        redirect: 'manual',
+      }
+    )
+    expect(res4.status).toBe(200)
+    const { pageProps: props4 } = await res4.json()
+    expect(props4.gspCalls).toBe(props3.gspCalls)
   })
 
   it('should set correct SWR headers with notFound gsp', async () => {
@@ -218,6 +241,8 @@ describe('should set-up next', () => {
     const res2 = await fetchViaHTTP(appPort, '/gssp', undefined, {
       redirect: 'manual ',
     })
+    await next.patchFile('standalone/data.txt', 'show')
+
     expect(res2.status).toBe(404)
     expect(res2.headers.get('cache-control')).toBe(
       's-maxage=1, stale-while-revalidate'
@@ -225,18 +250,18 @@ describe('should set-up next', () => {
   })
 
   it('should render SSR page correctly', async () => {
-    const html = await renderViaHTTP(appPort, '/')
+    const html = await renderViaHTTP(appPort, '/gssp')
     const $ = cheerio.load(html)
     const data = JSON.parse($('#props').text())
 
-    expect($('#index').text()).toBe('index page')
+    expect($('#gssp').text()).toBe('getServerSideProps page')
     expect(data.hello).toBe('world')
 
-    const html2 = await renderViaHTTP(appPort, '/')
+    const html2 = await renderViaHTTP(appPort, '/gssp')
     const $2 = cheerio.load(html2)
     const data2 = JSON.parse($2('#props').text())
 
-    expect($2('#index').text()).toBe('index page')
+    expect($2('#gssp').text()).toBe('getServerSideProps page')
     expect(isNaN(data2.random)).toBe(false)
     expect(data2.random).not.toBe(data.random)
   })
@@ -300,24 +325,24 @@ describe('should set-up next', () => {
   it('should render SSR page correctly with x-matched-path', async () => {
     const html = await renderViaHTTP(appPort, '/some-other-path', undefined, {
       headers: {
-        'x-matched-path': '/',
+        'x-matched-path': '/gssp',
       },
     })
     const $ = cheerio.load(html)
     const data = JSON.parse($('#props').text())
 
-    expect($('#index').text()).toBe('index page')
+    expect($('#gssp').text()).toBe('getServerSideProps page')
     expect(data.hello).toBe('world')
 
     const html2 = await renderViaHTTP(appPort, '/some-other-path', undefined, {
       headers: {
-        'x-matched-path': '/',
+        'x-matched-path': '/gssp',
       },
     })
     const $2 = cheerio.load(html2)
     const data2 = JSON.parse($2('#props').text())
 
-    expect($2('#index').text()).toBe('index page')
+    expect($2('#gssp').text()).toBe('getServerSideProps page')
     expect(isNaN(data2.random)).toBe(false)
     expect(data2.random).not.toBe(data.random)
   })
@@ -564,7 +589,7 @@ describe('should set-up next', () => {
       },
       {
         headers: {
-          'x-matched-path': '/',
+          'x-matched-path': '/gssp',
         },
       }
     )
diff --git a/test/production/required-server-files/pages/gssp.js b/test/production/required-server-files/pages/gssp.js
index 653736f016f41..625cfb7c51386 100644
--- a/test/production/required-server-files/pages/gssp.js
+++ b/test/production/required-server-files/pages/gssp.js
@@ -1,5 +1,6 @@
 import fs from 'fs'
 import path from 'path'
+import { useRouter } from 'next/router'
 
 export async function getServerSideProps({ res }) {
   res.setHeader('cache-control', 's-maxage=1, stale-while-revalidate')
@@ -19,6 +20,7 @@ export async function getServerSideProps({ res }) {
     props: {
       hello: 'world',
       data,
+      random: Math.random(),
       // make sure fetch if polyfilled
       example: await fetch('https://example.com').then((res) => res.text()),
     },
@@ -26,9 +28,12 @@ export async function getServerSideProps({ res }) {
 }
 
 export default function Page(props) {
+  const router = useRouter()
+
   return (
     <>
-      <p id="gsp">getStaticProps page</p>
+      <p id="gssp">getServerSideProps page</p>
+      <p id="router">{JSON.stringify(router)}</p>
       <p id="props">{JSON.stringify(props)}</p>
     </>
   )
diff --git a/test/production/required-server-files/pages/index.js b/test/production/required-server-files/pages/index.js
index 74e172d935aba..8e07e51734615 100644
--- a/test/production/required-server-files/pages/index.js
+++ b/test/production/required-server-files/pages/index.js
@@ -8,12 +8,18 @@ if (localConfig.hello !== 'world') {
   throw new Error('oof import order is wrong, _app comes first')
 }
 
-export const getServerSideProps = ({ req }) => {
+let gspCalls = 0
+
+export const getStaticProps = () => {
+  gspCalls += 1
+
   return {
     props: {
       hello: 'world',
       random: Math.random(),
+      gspCalls,
     },
+    revalidate: 1,
   }
 }