diff --git a/kittens/panel/main.py b/kittens/panel/main.py
index 741773d46..778756609 100644
--- a/kittens/panel/main.py
+++ b/kittens/panel/main.py
@@ -369,6 +369,8 @@ def main(sys_args: list[str]) -> None:
     sys.argv.append('--override=macos_quit_when_last_window_closed=yes')
     if args.single_instance:
         sys.argv.append('--single-instance')
+    if args.instance_group:
+        sys.argv.append(f'--instance-group={args.instance_group}')
     if args.listen_on:
         sys.argv.append(f'--listen-on={args.listen_on}')