diff --git a/kitty/cmds.py b/kitty/cmds.py
index 174174e89..a9c20ab5b 100644
--- a/kitty/cmds.py
+++ b/kitty/cmds.py
@@ -93,6 +93,7 @@ def windows_for_payload(boss, window, payload):
                 raise MatchError(payload['match_tab'], 'tabs')
             for tab in tabs:
                 windows += tuple(tab)
+    return windows
 
 
 # ls {{{