diff --git a/lib/private/connector/sabre/file.php b/lib/private/connector/sabre/file.php
index 5333583e78..246749903b 100644
--- a/lib/private/connector/sabre/file.php
+++ b/lib/private/connector/sabre/file.php
@@ -105,7 +105,7 @@ class OC_Connector_Sabre_File extends OC_Connector_Sabre_Node implements \Sabre\
 		// if content length is sent by client:
 		// double check if the file was fully received
 		// compare expected and actual size
-		if (isset($_SERVER['CONTENT_LENGTH'])) {
+		if (isset($_SERVER['CONTENT_LENGTH']) && $_SERVER['REQUEST_METHOD'] !== 'LOCK') {
 			$expected = $_SERVER['CONTENT_LENGTH'];
 			$actual = $this->fileView->filesize($partFilePath);
 			if ($actual != $expected) {