diff --git a/apt-sync.py b/apt-sync.py
index 9bc5e11..9f1fc76 100755
--- a/apt-sync.py
+++ b/apt-sync.py
@@ -142,7 +142,7 @@ def apt_mirror(
     repo: str,
     arch: str,
     dest_base_dir: Path,
-    deb_set: Dict[str, int,],
+    deb_set: Dict[str, int],
     skip_checksum: bool
 ) -> int:
     if not dest_base_dir.is_dir():