diff --git a/dlibrary.py b/dlibrary.py
index 0e57883..8626cb3 100755
--- a/dlibrary.py
+++ b/dlibrary.py
@@ -202,7 +202,9 @@ def collate(args):
     con.close()
 
 def manual_collate(args):
-    collation_dir = args.destdir / 'site' / 'images' / args.work_id
+    work_id = args.paths[0].relative_to(args.destdir / 'extract').parents[-2].name
+
+    collation_dir = args.destdir / 'site' / 'images' / work_id
     if collation_dir.exists() and len(list(collation_dir.iterdir())) > 0:
         print(f'Collation directory already exists!')
         return
@@ -346,7 +348,6 @@ parser_collate.add_argument(
 parser_collate.set_defaults(func=collate)
 
 parser_manual_collate = subparsers.add_parser('manual-collate', help='collate a specific work manually, specifying all paths to include')
-parser_manual_collate.add_argument('work_id')
 parser_manual_collate.add_argument(
     'paths',
     metavar='PATH',