diff --git a/azure/templates/marketplace-ha/mainTemplate.json b/azure/templates/marketplace-ha/mainTemplate.json
index b267a808..0f2399c5 100644
--- a/azure/templates/marketplace-ha/mainTemplate.json
+++ b/azure/templates/marketplace-ha/mainTemplate.json
@@ -633,7 +633,7 @@
       "name": "[variables('ipPrefixNewName')]",
       "location": "[variables('location')]",
       "properties": {
-        "prefixLength": "30",
+        "prefixLength": "[if(greater(variables('VIPs_Number'), 5), '28', if(greater(variables('VIPs_Number'), 1), '29', '30'))]",
         "publicIPAddressVersion": "IPv4"
       },
       "sku": {