diff --git a/src/run/headers.test.ts b/src/run/headers.test.ts
index 4ca423e40..f20bee6a4 100644
--- a/src/run/headers.test.ts
+++ b/src/run/headers.test.ts
@@ -40,7 +40,7 @@ describe('headers', () => {
 
         expect(headers.set).toBeCalledWith(
           'netlify-vary',
-          'header=x-nextjs-data|x-next-debug-logging,cookie=__prerender_bypass|__next_preview_data',
+          'query=__nextDataReq,header=x-nextjs-data|x-next-debug-logging,cookie=__prerender_bypass|__next_preview_data',
         )
       })
 
@@ -56,7 +56,7 @@ describe('headers', () => {
 
         expect(headers.set).toBeCalledWith(
           'netlify-vary',
-          'header=x-nextjs-data|x-next-debug-logging|Accept|Accept-Language,cookie=__prerender_bypass|__next_preview_data',
+          'query=__nextDataReq,header=x-nextjs-data|x-next-debug-logging|Accept|Accept-Language,cookie=__prerender_bypass|__next_preview_data',
         )
       })
 
@@ -77,7 +77,7 @@ describe('headers', () => {
 
         expect(headers.set).toBeCalledWith(
           'netlify-vary',
-          'header=x-nextjs-data|x-next-debug-logging,cookie=__prerender_bypass|__next_preview_data',
+          'query=__nextDataReq,header=x-nextjs-data|x-next-debug-logging,cookie=__prerender_bypass|__next_preview_data',
         )
       })
 
@@ -97,7 +97,7 @@ describe('headers', () => {
 
         expect(headers.set).toBeCalledWith(
           'netlify-vary',
-          'header=x-nextjs-data|x-next-debug-logging,cookie=__prerender_bypass|__next_preview_data',
+          'query=__nextDataReq,header=x-nextjs-data|x-next-debug-logging,cookie=__prerender_bypass|__next_preview_data',
         )
       })
 
@@ -117,7 +117,7 @@ describe('headers', () => {
 
         expect(headers.set).toBeCalledWith(
           'netlify-vary',
-          'header=x-nextjs-data|x-next-debug-logging,language=en|de|fr,cookie=__prerender_bypass|__next_preview_data|NEXT_LOCALE',
+          'query=__nextDataReq,header=x-nextjs-data|x-next-debug-logging,language=en|de|fr,cookie=__prerender_bypass|__next_preview_data|NEXT_LOCALE',
         )
       })
 
@@ -138,7 +138,7 @@ describe('headers', () => {
 
         expect(headers.set).toBeCalledWith(
           'netlify-vary',
-          'header=x-nextjs-data|x-next-debug-logging,language=en|de|fr,cookie=__prerender_bypass|__next_preview_data|NEXT_LOCALE',
+          'query=__nextDataReq,header=x-nextjs-data|x-next-debug-logging,language=en|de|fr,cookie=__prerender_bypass|__next_preview_data|NEXT_LOCALE',
         )
       })
 
@@ -185,7 +185,7 @@ describe('headers', () => {
 
         expect(headers.set).toBeCalledWith(
           'netlify-vary',
-          'query=item_id|page|per_page,header=x-nextjs-data|x-next-debug-logging|x-custom-header,language=en|de|fr|es,cookie=__prerender_bypass|__next_preview_data|NEXT_LOCALE|ab_test,country=es',
+          'query=__nextDataReq|item_id|page|per_page,header=x-nextjs-data|x-next-debug-logging|x-custom-header,language=en|de|fr|es,cookie=__prerender_bypass|__next_preview_data|NEXT_LOCALE|ab_test,country=es',
         )
       })
     })
diff --git a/src/run/headers.ts b/src/run/headers.ts
index 12c56871a..e1ad53e37 100644
--- a/src/run/headers.ts
+++ b/src/run/headers.ts
@@ -81,7 +81,7 @@ export const setVaryHeaders = (
     header: ['x-nextjs-data', 'x-next-debug-logging'],
     language: [],
     cookie: ['__prerender_bypass', '__next_preview_data'],
-    query: [],
+    query: ['__nextDataReq'],
     country: [],
   }