diff --git a/release/config/sing-box.postinst b/release/config/sing-box.postinst
index 770dd22a..ac1e4efd 100644
--- a/release/config/sing-box.postinst
+++ b/release/config/sing-box.postinst
@@ -1,3 +1,9 @@
 #!/bin/sh
 
+set -e
+
 systemd-sysusers sing-box.conf
+
+if [ -d /run/systemd/system ]; then
+    systemctl --system daemon-reload >/dev/null || true
+fi