diff --git a/rc.in b/rc.in
index d68280b..22b7a7f 100644
--- a/rc.in
+++ b/rc.in
@@ -132,7 +132,7 @@ rc.halt() {
 	if type -P halt; then
 		function rc.halt_poweroff { halt -p; }
 		function rc.halt_reboot { halt -r; }
-	elif [[ -f /proc/sysrq-trigger ]]; then
+	elif (( $(</proc/sys/kernel/sysrq) )); then
 		function rc.halt_poweroff { echo 'o' > /proc/sysrq-trigger; }
 		function rc.halt_reboot { echo 'b' > /proc/sysrq-trigger; }
 	else