diff --git a/minifirewall b/minifirewall
index a09b722..34f3000 100755
--- a/minifirewall
+++ b/minifirewall
@@ -37,6 +37,11 @@ DESC="Firewall designed for standalone server"
 
 set -u
 
+if [ "$(id -u)" -ne "0" ] ; then
+    echo "${PROGNAME} must be run as root." >&2
+    exit 1
+fi
+
 # Variables configuration
 #########################