diff --git a/hlna.py b/hlna.py
index 8e349f9..0244c1e 100755
--- a/hlna.py
+++ b/hlna.py
@@ -422,7 +422,8 @@ def modextract(id_mod, id_game_workshop):
             modpathlen = len(modpath)
             print(id_mod, 0, modnamelen, modname, modpathlen, modpath)
             type(id_mod)
-            modfile_bytes += struct.pack('<L', int(id_mod))
+            modfile_bytes += struct.pack('<LLL{}sL{}sL'.format(modnamelen, modpathlen),
+                                         int(id_mod), 0, modnamelen, modname, modpathlen, modpath, nummaps)
             for _ in range(nummaps):
                 mapfilelen = struct.unpack_from('<L', data, offset=pos)
                 mapfilelen = mapfilelen[0]