diff --git a/functions/dav/[[path]].js b/functions/dav/[[path]].js
index e938b790..d2e8bd3f 100644
--- a/functions/dav/[[path]].js
+++ b/functions/dav/[[path]].js
@@ -324,6 +324,6 @@ function createCollectionXml(path) {
 
 function createFileXml(file) {
     const now = new Date().toUTCString();
-    const fileSize = file.metadata && file.metadata['File-Size'] ? file.metadata['File-Size'] : "0";
-    return `<D:response><D:href>${encodeURI(`/${file.name}`)}</D:href><D:propstat><D:prop><D:displayname>${file.name.split('/').pop()}</D:displayname><D:resourcetype/><D:creationdate>${now}</D:creationdate><D:getlastmodified>${now}</D:getlastmodified><D:getcontentlength>${fileSize}</D:getcontentlength></D:prop><D:status>HTTP/1.1 200 OK</D:status></D:propstat></D:response>`;
+    const fileSize = file.metadata && file.metadata['FileSizeBytes'] ? file.metadata['FileSizeBytes'] : "0";
+    return `<D:response><D:href>${encodeURI(`/dav/${file.name}`)}</D:href><D:propstat><D:prop><D:displayname>${file.name.split('/').pop()}</D:displayname><D:resourcetype/><D:creationdate>${now}</D:creationdate><D:getlastmodified>${now}</D:getlastmodified><D:getcontentlength>${fileSize}</D:getcontentlength></D:prop><D:status>HTTP/1.1 200 OK</D:status></D:propstat></D:response>`;
 }