diff --git a/config/tmux/tmux.conf b/config/tmux/tmux.conf
index 2cfab91..b73d52b 100644
--- a/config/tmux/tmux.conf
+++ b/config/tmux/tmux.conf
@@ -13,6 +13,8 @@ set -g default-terminal "tmux-256color"
 # force utf-8
 setw -gq utf8 on
 
+# force vi
+set-window-option -g mode-keys vi
 
 # disable mouse-mode
 set -g mouse off