diff --git a/data/scripts/o b/data/scripts/o
index 2ce62ab..4df8d09 100755
--- a/data/scripts/o
+++ b/data/scripts/o
@@ -309,7 +309,7 @@ cmd_tui() {
 
     # Layout: chat (top 80%), prompt (bottom 20%)
     tmux new-session -d -s "$tmux_session" -c "$HOME"
-    tmux set-option -t "$tmux_session" mouse on
+    tmux set-option -g mouse on
     tmux send-keys -t "$tmux_session" "o $s/$a log -n 1000 | grep -v '\\[\\[\\[.*\\]\\]\\]' | grep -v '^\`\`\`'; o $s/$a read chat" Enter
 
     tmux split-window -t "$tmux_session" -v -l 20%