diff --git a/misc/build.func b/misc/build.func
index b00eac9c..0bfe7430 100644
--- a/misc/build.func
+++ b/misc/build.func
@@ -2108,7 +2108,12 @@ start() {
 build_container() {
   #  if [ "$VERBOSE" == "yes" ]; then set -x; fi
 
-  NET_STRING="-net0 name=eth0,bridge=${BRG:-vmbr0}${MAC:-},ip=${NET:-dhcp}${GATE:-}${VLAN:-}${MTU:-}"
+  NET_STRING="-net0 name=eth0,bridge=${BRG:-vmbr0}"
+  NET_STRING+="${MAC:+,hwaddr=$MAC}"
+  NET_STRING+=",ip=${NET:-dhcp}"
+  NET_STRING+="${GATE:+,gw=$GATE}"
+  NET_STRING+="${VLAN:+,tag=$VLAN}"
+  NET_STRING+="${MTU:+,mtu=$MTU}"
   case "$IPV6_METHOD" in
   auto) NET_STRING="$NET_STRING,ip6=auto" ;;
   dhcp) NET_STRING="$NET_STRING,ip6=dhcp" ;;