diff --git a/xsession/bin/lupan-set-theme b/xsession/bin/lupan-set-theme
index b7abfe2..e6f4ff4 100755
--- a/xsession/bin/lupan-set-theme
+++ b/xsession/bin/lupan-set-theme
@@ -75,6 +75,7 @@ fi
 WCSS=$(readlink -e ~/.config/waybar/style.css)
 if [ -f "$WCSS" ]; then
     sed -i -E "s#file:///.*/(light|dark)[.]css#file://$HOME/.config/waybar/$THEME.css#" "$WCSS"
+    killall -SIGUSR2 waybar
 fi
 
 for session in $(kak -l); do