diff --git a/.tmux.conf b/.tmux.conf
index a29b891..115c1e1 100644
--- a/.tmux.conf
+++ b/.tmux.conf
@@ -250,7 +250,7 @@ run 'cut -c3- ~/.tmux.conf | sh -s _apply_configuration'
 #   case "$uname_s" in
 #     *Darwin*)
 #       batt=$(pmset -g batt)
-#       percentage=$(echo "$batt" |egrep -o [0-9]+%) || return
+#       percentage=$(echo "$batt" | grep -E -o [0-9]+%) || return
 #       discharging=$(echo "$batt" | grep -qi "discharging" && echo "true" || echo "false")
 #       charge="${percentage%%%} / 100"
 #       ;;