diff --git a/samples/manage/azure-sql-db-managed-instance/attach-vpn-gateway/attachVPNGateway.ps1 b/samples/manage/azure-sql-db-managed-instance/attach-vpn-gateway/attachVPNGateway.ps1
index 8d4ba24d..cc24262a 100644
--- a/samples/manage/azure-sql-db-managed-instance/attach-vpn-gateway/attachVPNGateway.ps1
+++ b/samples/manage/azure-sql-db-managed-instance/attach-vpn-gateway/attachVPNGateway.ps1
@@ -178,4 +178,4 @@ $templateParameters = @{
     publicRootCertData  = $publicRootCertData
     }
 
-New-AzureRmResourceGroupDeployment -ResourceGroupName $resourceGroupName -TemplateUri ($scriptUrlBase+'/azuredeploy.json?t='+ [DateTime]::Now.Ticks) -TemplateParameterObject $templateParameters
+New-AzureRmResourceGroupDeployment -Mode Incremental -ResourceGroupName $resourceGroupName -TemplateUri ($scriptUrlBase+'/azuredeploy.json?t='+ [DateTime]::Now.Ticks) -TemplateParameterObject $templateParameters
diff --git a/samples/manage/azure-sql-db-managed-instance/attach-vpn-gateway/azuredeploy.json b/samples/manage/azure-sql-db-managed-instance/attach-vpn-gateway/azuredeploy.json
index ad959edb..6a53bcec 100644
--- a/samples/manage/azure-sql-db-managed-instance/attach-vpn-gateway/azuredeploy.json
+++ b/samples/manage/azure-sql-db-managed-instance/attach-vpn-gateway/azuredeploy.json
@@ -48,7 +48,6 @@
             "apiVersion": "2018-02-01",
             "location": "[parameters('location')]",
             "properties": {
-                "mode": "Incremental",
                 "addressSpace": {
                     "addressPrefixes": [
                         "[parameters('gatewaySubnetPrefix')]"