diff -r 592ff4ca2aaa -r 645f7e802873 dav/tar.c
--- a/dav/tar.c	Thu Jul 20 22:15:01 2023 +0200
+++ b/dav/tar.c	Thu Aug 10 09:40:54 2023 +0200
@@ -104,7 +104,7 @@
     memset(h.gid, '0', 8);
     h.gid[7] = ' ';
     // size
-    snprintf(h.size, 12, "%011lo", size);
+    snprintf(h.size, 12, "%011lo", (unsigned long)size);
     h.size[11] = ' ';
     // mtime
     uint64_t t = (uint64_t)mtime;