diff --git a/devstack/plugin.sh b/devstack/plugin.sh
index da3c0093e..b1cc68fad 100644
--- a/devstack/plugin.sh
+++ b/devstack/plugin.sh
@@ -9,7 +9,7 @@ IRONIC_INSPECTOR_CMD="$IRONIC_INSPECTOR_BIN_FILE --config-file $IRONIC_INSPECTOR
 IRONIC_INSPECTOR_DHCP_CONF_FILE=$IRONIC_INSPECTOR_CONF_DIR/dnsmasq.conf
 IRONIC_INSPECTOR_ROOTWRAP_CONF_FILE=$IRONIC_INSPECTOR_CONF_DIR/rootwrap.conf
 IRONIC_INSPECTOR_ADMIN_USER=${IRONIC_INSPECTOR_ADMIN_USER:-ironic-inspector}
-IRONIC_INSPECTOR_MANAGE_FIREWALL=$(trueorfalse True $IRONIC_INSPECTOR_MANAGE_FIREWALL)
+IRONIC_INSPECTOR_MANAGE_FIREWALL=$(trueorfalse True IRONIC_INSPECTOR_MANAGE_FIREWALL)
 IRONIC_INSPECTOR_HOST=$HOST_IP
 IRONIC_INSPECTOR_PORT=5050
 IRONIC_INSPECTOR_URI="http://$IRONIC_INSPECTOR_HOST:$IRONIC_INSPECTOR_PORT"