diff --git a/roles/tmux.nix b/roles/tmux.nix
index b3c265d..5864ac8 100644
--- a/roles/tmux.nix
+++ b/roles/tmux.nix
@@ -46,6 +46,7 @@
         set-window-option -g window-status-bell-style fg=black,bg=red #base02, red
       '';
       terminal = "screen-256color";
+      keyMode = "vi";
     };
   };