diff --git a/subcmds/sync.py b/subcmds/sync.py
index bfe146b..595a35a 100644
--- a/subcmds/sync.py
+++ b/subcmds/sync.py
@@ -261,6 +261,8 @@
                                       pm,
                                       sem,
                                       err_event))
+        # Ensure that Ctrl-C will not freeze the repo process.
+        t.daemon = True
         threads.add(t)
         t.start()