diff --git a/src/install.sh b/src/install.sh
index 8a6dfa1..a473e7b 100644
--- a/src/install.sh
+++ b/src/install.sh
@@ -628,7 +628,9 @@ updateXML() {
   local language="$2"
   local culture region user admin pass keyboard
 
-  sed -i "s/ 20.20.20.1 / ${VM_NET_IP%.*}.1 /g" "$asset"
+  if [ -n "${VM_NET_IP:-}" ]; then
+    sed -i "s/ 20.20.20.1 / ${VM_NET_IP%.*}.1 /g" "$asset"
+  fi
 
   [ -z "$HEIGHT" ] && HEIGHT="720"
   [ -z "$WIDTH" ] && WIDTH="1280"