diff --git a/usr/libexec/security-misc/kill-vboxdrmclient-on-shutdown#security-misc-shared b/usr/libexec/security-misc/kill-vboxdrmclient-on-shutdown#security-misc-shared
index 83f7780..677dc90 100755
--- a/usr/libexec/security-misc/kill-vboxdrmclient-on-shutdown#security-misc-shared
+++ b/usr/libexec/security-misc/kill-vboxdrmclient-on-shutdown#security-misc-shared
@@ -20,7 +20,7 @@ if [ -z "$sock_pid" ]; then
   printf '%s\n' "INFO: Cannot get PID listening on '$vboxdrmclient_sock', ok."
   exit 0
 fi
-if kill -SIGKILL "$sock_pid"; then
+if kill -SIGKILL -- "$sock_pid"; then
   printf '%s\n' "INFO: Killed VBoxDRMClient ('$sock_pid'), ok."
   exit 0
 fi