diff --git a/.tmux.conf b/.tmux.conf
index 750c09e..3450156 100644
--- a/.tmux.conf
+++ b/.tmux.conf
@@ -3,7 +3,7 @@ set-option -g status-style bg=colour11,fg=colour136,default # bg=base02, fg=yell
 
 # set window split
 bind-key v split-window -h
-bind-key b split-window
+bind-key b split-window -h
 
 # default window title colors
 set-window-option -g window-status-style fg=colour11,bg=default,dim # fg=base0