diff --git a/core-bundle/src/EventListener/SubrequestCacheSubscriber.php b/core-bundle/src/EventListener/SubrequestCacheSubscriber.php
index 3776105e2d2..8651f03bfff 100644
--- a/core-bundle/src/EventListener/SubrequestCacheSubscriber.php
+++ b/core-bundle/src/EventListener/SubrequestCacheSubscriber.php
@@ -82,6 +82,7 @@ public function onKernelResponse(ResponseEvent $event): void
 
         if ($isMasterRequest) {
             $this->currentStrategy = array_pop($this->strategyStack);
+            $response->headers->remove(self::MERGE_CACHE_HEADER);
         }
     }
 
diff --git a/core-bundle/tests/EventListener/SubrequestCacheSubscriberTest.php b/core-bundle/tests/EventListener/SubrequestCacheSubscriberTest.php
index 704dedd1a25..0f784ad4948 100644
--- a/core-bundle/tests/EventListener/SubrequestCacheSubscriberTest.php
+++ b/core-bundle/tests/EventListener/SubrequestCacheSubscriberTest.php
@@ -57,6 +57,7 @@ public function testMergesCacheControlHeader(): void
 
         $this->assertSame(30, $mainResponse->getMaxAge());
         $this->assertSame('max-age=30, public', $mainResponse->headers->get('Cache-Control'));
+        $this->assertFalse($mainResponse->headers->has(SubrequestCacheSubscriber::MERGE_CACHE_HEADER));
     }
 
     public function testMakeMasterResponsePrivateIfSubrequestIsPrivate(): void
@@ -79,6 +80,7 @@ public function testMakeMasterResponsePrivateIfSubrequestIsPrivate(): void
         $this->onKernelResponse($subscriber, $mainResponse, KernelInterface::MASTER_REQUEST);
 
         $this->assertSame('private', $mainResponse->headers->get('Cache-Control'));
+        $this->assertFalse($mainResponse->headers->has(SubrequestCacheSubscriber::MERGE_CACHE_HEADER));
     }
 
     public function testIgnoresSubrequestWithoutMergeHeader(): void
@@ -100,6 +102,7 @@ public function testIgnoresSubrequestWithoutMergeHeader(): void
         $this->onKernelResponse($subscriber, $mainResponse, KernelInterface::MASTER_REQUEST);
 
         $this->assertSame('max-age=60, public', $mainResponse->headers->get('Cache-Control'));
+        $this->assertFalse($mainResponse->headers->has(SubrequestCacheSubscriber::MERGE_CACHE_HEADER));
     }
 
     public function testIgnoresSubrequestWithoutCacheControlHeader(): void
@@ -122,6 +125,7 @@ public function testIgnoresSubrequestWithoutCacheControlHeader(): void
         $this->onKernelResponse($subscriber, $mainResponse, KernelInterface::MASTER_REQUEST);
 
         $this->assertSame('max-age=60, public', $mainResponse->headers->get('Cache-Control'));
+        $this->assertFalse($mainResponse->headers->has(SubrequestCacheSubscriber::MERGE_CACHE_HEADER));
     }
 
     private function onKernelRequest(SubrequestCacheSubscriber $subscriber, int $requestType): void