diff --git a/load_balancer/main.tf b/load_balancer/main.tf
index 09b3fe2d..c74234a2 100644
--- a/load_balancer/main.tf
+++ b/load_balancer/main.tf
@@ -31,7 +31,7 @@ resource "azurerm_lb" "this" {
 
   frontend_ip_configuration {
     name                          = var.frontend_name
-    public_ip_address_id          = var.type == "public" ? join("", azurerm_public_ip.this.*.id) : ""
+    public_ip_address_id          = var.type == "public" ? join("", azurerm_public_ip.this.*.id) : null
     subnet_id                     = var.frontend_subnet_id
     private_ip_address            = var.frontend_private_ip_address
     private_ip_address_allocation = var.frontend_private_ip_address_allocation