diff --git a/lib/private/Files/Storage/Local.php b/lib/private/Files/Storage/Local.php
index e2eaab98b1b8c..a5767d5b9a028 100644
--- a/lib/private/Files/Storage/Local.php
+++ b/lib/private/Files/Storage/Local.php
@@ -364,6 +364,8 @@ public function copy($path1, $path2) {
 			return parent::copy($path1, $path2);
 		} else {
 			$oldMask = umask(022);
+			// support Write-Once-Read-Many filesystems
+			$this->unlink($path2);
 			$result = copy($this->getSourcePath($path1), $this->getSourcePath($path2));
 			umask($oldMask);
 			return $result;