diff --git a/lib/private/Files/Stream/Encryption.php b/lib/private/Files/Stream/Encryption.php
index bc4d071627001..9cc8b238ee1c2 100644
--- a/lib/private/Files/Stream/Encryption.php
+++ b/lib/private/Files/Stream/Encryption.php
@@ -528,6 +528,7 @@ protected function readCache() {
 	 */
 	protected function writeHeader() {
 		$header = $this->util->createHeader($this->newHeader, $this->encryptionModule);
+		$this->fileUpdated = true;
 		return parent::stream_write($header);
 	}