diff --git a/.tmux.conf b/.tmux.conf
index 6de9c24..bf97827 100644
--- a/.tmux.conf
+++ b/.tmux.conf
@@ -692,7 +692,7 @@ run 'cut -c3- ~/.tmux.conf | sh -s _apply_configuration'
 # _apply_tmux_256color() {
 #   # when tmux-256color is available, use it
 #   # on macOS though, make sure to use /usr/bin/infocmp to probe if it's availalbe system wide
-#   case "$uname_s" in
+#   case "$_uname_s" in
 #     *Darwin*)
 #       if /usr/bin/infocmp -x tmux-256color > /dev/null 2>&1; then
 #         tmux set -g default-terminal 'tmux-256color'