diff --git a/scripts/wk/ui/tmux.py b/scripts/wk/ui/tmux.py
index 94c4792a..d53c3ba3 100644
--- a/scripts/wk/ui/tmux.py
+++ b/scripts/wk/ui/tmux.py
@@ -99,8 +99,7 @@ def fix_layout(
     num_panes = len(data['Panes'])
     if num_panes < 2 or group not in ('Title', 'Info'):
       continue
-    avail_horizontal -= (num_panes - 1)
-    pane_width, remainder = divmod(avail_horizontal, num_panes)
+    pane_width, remainder = divmod(avail_horizontal - (num_panes-1), num_panes)
     for pane_id in data['Panes']:
       new_width = pane_width
       if remainder > 0: