diff --git a/.tmux.conf b/.tmux.conf
index 69478dd..43c90ab 100644
--- a/.tmux.conf
+++ b/.tmux.conf
@@ -4,6 +4,7 @@ set -g prefix C-k
 set -g escape-time 20
 set -g mouse on
 set -g history-limit 1000000
+set -g mode-key vi
 
 bind-key C-k send-prefix
 unbind C-b