diff --git a/.tmux.conf b/.tmux.conf
index d18644f2..de5e105c 100644
--- a/.tmux.conf
+++ b/.tmux.conf
@@ -26,7 +26,7 @@ bind-key -T copy-mode-vi 'r' send -X rectangle-toggle
 bind-key -T copy-mode-vi 'y' send -X copy-pipe-and-cancel "reattach-to-user-namespace pbcopy"
 
 # colors
-set -g pane-active-border-fg brightred
+set -g pane-active-border-style fg=brightred
 
 # statusline (shamelessly stolen from powerline)
 set-option -g status-interval 2