diff --git a/.tmux.conf b/.tmux.conf
index 803f2593..9410add5 100644
--- a/.tmux.conf
+++ b/.tmux.conf
@@ -19,7 +19,7 @@ set-option -g automatic-rename on
 set-window-option -g mouse off
 
 # copy and paste
-set-option mode-keys vi
+set-window-option -g mode-keys vi
 bind-key -T copy-mode-vi 'v' send -X begin-selection
 bind-key -T copy-mode-vi 'V' send -X select-line
 bind-key -T copy-mode-vi 'r' send -X rectangle-toggle