diff --git a/apps/dav/lib/Connector/Sabre/FilesPlugin.php b/apps/dav/lib/Connector/Sabre/FilesPlugin.php
index 83ec30e089301..bc47d63122b6c 100644
--- a/apps/dav/lib/Connector/Sabre/FilesPlugin.php
+++ b/apps/dav/lib/Connector/Sabre/FilesPlugin.php
@@ -278,6 +278,7 @@ public function httpGet(RequestInterface $request, ResponseInterface $response)
 			}
 		}
 		$response->addHeader('X-Accel-Buffering', 'no');
+		$response->addHeader('Cache-Control', 'private, no-cache, must-revalidate');
 	}
 
 	/**
diff --git a/apps/dav/tests/unit/Connector/Sabre/FilesPluginTest.php b/apps/dav/tests/unit/Connector/Sabre/FilesPluginTest.php
index a5a8358d61faa..97cc260ce2b9f 100644
--- a/apps/dav/tests/unit/Connector/Sabre/FilesPluginTest.php
+++ b/apps/dav/tests/unit/Connector/Sabre/FilesPluginTest.php
@@ -641,6 +641,7 @@ public function testDownloadHeaders(bool $isClumsyAgent, string $contentDisposit
 		$calls = [
 			['Content-Disposition', $contentDispositionHeader],
 			['X-Accel-Buffering', 'no'],
+			['Cache-Control', 'private, no-cache, must-revalidate'],
 		];
 		$response
 			->expects($this->exactly(count($calls)))