diff --git a/provision/dcc.sh b/provision/dcc.sh
index db78715d..51f6f5f2 100755
--- a/provision/dcc.sh
+++ b/provision/dcc.sh
@@ -34,7 +34,7 @@ install_dcc_port_options()
 
 	get_public_ip ipv6
 	if [ -z "$PUBLIC_IP6" ]; then
-		UNSET="$UNSET IPv6"
+		UNSET="$UNSET IPV6"
 	else
 		SET="$SET IPV6"
 	fi