diff --git a/lib/Versions/VersionsBackend.php b/lib/Versions/VersionsBackend.php
index fdbcf1ac0..dd8a7cdd0 100644
--- a/lib/Versions/VersionsBackend.php
+++ b/lib/Versions/VersionsBackend.php
@@ -457,4 +457,9 @@ public function clearVersionsForFile(IUser $user, Node $source, Node $target): v
 		$folderId = $this->getFolderIdForFile($source);
 		$this->deleteAllVersionsForFile($folderId, $target->getId());
 	}
+
+	public function getRevision(Node $node): int {
+		return $node->getMTime();
+	}
+
 }