diff --git a/backend_service_external_iap/main.tf b/backend_service_external_iap/main.tf
index 543ab8dd..daf4619f 100644
--- a/backend_service_external_iap/main.tf
+++ b/backend_service_external_iap/main.tf
@@ -3,6 +3,7 @@ resource "google_compute_backend_service" "default" {
   protocol              = "HTTP"
   load_balancing_scheme = "EXTERNAL"
   iap {
+    enabled              = true
     oauth2_client_id     = "abc"
     oauth2_client_secret = "xyz"
   }
diff --git a/region_backend_service_external_iap/main.tf b/region_backend_service_external_iap/main.tf
index b3b5ae37..08439a7c 100644
--- a/region_backend_service_external_iap/main.tf
+++ b/region_backend_service_external_iap/main.tf
@@ -4,6 +4,7 @@ resource "google_compute_region_backend_service" "default" {
   protocol              = "HTTP"
   load_balancing_scheme = "EXTERNAL"
   iap {
+    enabled              = true
     oauth2_client_id     = "abc"
     oauth2_client_secret = "xyz"
   }