diff --git a/lib/private/Files/Storage/FailedStorage.php b/lib/private/Files/Storage/FailedStorage.php
index d2aae33bb2173ce0da043ee4146ca5b72fa0e54d..d4046b62fee9e4fa6c07ef7549d9b4e5a3651efb 100644
--- a/lib/private/Files/Storage/FailedStorage.php
+++ b/lib/private/Files/Storage/FailedStorage.php
@@ -184,7 +184,7 @@ class FailedStorage extends Common {
 		return true;
 	}
 
-	public function copyFromStorage(IStorage $sourceStorage, $sourceInternalPath, $targetInternalPath) {
+	public function copyFromStorage(IStorage $sourceStorage, $sourceInternalPath, $targetInternalPath, $preserveMtime = false) {
 		throw new StorageNotAvailableException($this->e->getMessage(), $this->e->getCode(), $this->e);
 	}