diff --git a/sh/tmux.sh b/sh/tmux.sh
index 21b84fc..701715e 100644
--- a/sh/tmux.sh
+++ b/sh/tmux.sh
@@ -8,6 +8,7 @@ rwx_tmux_setup() {
 	rwx_file_write "${file}" "\
 # first index number
 set-option -g base-index 1
+set-option -g pane-base-index 1
 # display duration
 set-option -g display-time 1536
 # reload configuration