diff --git a/blueprints/apigee/bigquery-analytics/main.tf b/blueprints/apigee/bigquery-analytics/main.tf
index 51f9a13f2..d1534ad77 100644
--- a/blueprints/apigee/bigquery-analytics/main.tf
+++ b/blueprints/apigee/bigquery-analytics/main.tf
@@ -143,7 +143,6 @@ module "bucket_export" {
     ]
   }
   notification_config = {
-    create_topic      = {}
     enabled           = true
     payload_format    = "JSON_API_V1"
     sa_email          = module.project.service_agents.storage.email
diff --git a/modules/gcs/README.md b/modules/gcs/README.md
index 2964f73f8..81103d25b 100644
--- a/modules/gcs/README.md
+++ b/modules/gcs/README.md
@@ -326,7 +326,7 @@ module "bucket" {
 | [lifecycle_rules](variables.tf#L107) | Bucket lifecycle rule. | <code title="map&#40;object&#40;&#123;&#10;  action &#61; object&#40;&#123;&#10;    type          &#61; string&#10;    storage_class &#61; optional&#40;string&#41;&#10;  &#125;&#41;&#10;  condition &#61; object&#40;&#123;&#10;    age                        &#61; optional&#40;number&#41;&#10;    created_before             &#61; optional&#40;string&#41;&#10;    custom_time_before         &#61; optional&#40;string&#41;&#10;    days_since_custom_time     &#61; optional&#40;number&#41;&#10;    days_since_noncurrent_time &#61; optional&#40;number&#41;&#10;    matches_prefix             &#61; optional&#40;list&#40;string&#41;&#41;&#10;    matches_storage_class      &#61; optional&#40;list&#40;string&#41;&#41; &#35; STANDARD, MULTI_REGIONAL, REGIONAL, NEARLINE, COLDLINE, ARCHIVE, DURABLE_REDUCED_AVAILABILITY&#10;    matches_suffix             &#61; optional&#40;list&#40;string&#41;&#41;&#10;    noncurrent_time_before     &#61; optional&#40;string&#41;&#10;    num_newer_versions         &#61; optional&#40;number&#41;&#10;    with_state                 &#61; optional&#40;string&#41; &#35; &#34;LIVE&#34;, &#34;ARCHIVED&#34;, &#34;ANY&#34;&#10;  &#125;&#41;&#10;&#125;&#41;&#41;">map&#40;object&#40;&#123;&#8230;&#125;&#41;&#41;</code> |  | <code>&#123;&#125;</code> |
 | [logging_config](variables.tf#L162) | Bucket logging configuration. | <code title="object&#40;&#123;&#10;  log_bucket        &#61; string&#10;  log_object_prefix &#61; optional&#40;string&#41;&#10;&#125;&#41;">object&#40;&#123;&#8230;&#125;&#41;</code> |  | <code>null</code> |
 | [managed_folders](variables.tf#L171) | Managed folders to create within the bucket in {PATH => CONFIG} format. | <code title="map&#40;object&#40;&#123;&#10;  force_destroy &#61; optional&#40;bool, false&#41;&#10;  iam           &#61; optional&#40;map&#40;list&#40;string&#41;&#41;, &#123;&#125;&#41;&#10;  iam_bindings &#61; optional&#40;map&#40;object&#40;&#123;&#10;    members &#61; list&#40;string&#41;&#10;    role    &#61; string&#10;    condition &#61; optional&#40;object&#40;&#123;&#10;      expression  &#61; string&#10;      title       &#61; string&#10;      description &#61; optional&#40;string&#41;&#10;    &#125;&#41;&#41;&#10;  &#125;&#41;&#41;, &#123;&#125;&#41;&#10;  iam_bindings_additive &#61; optional&#40;map&#40;object&#40;&#123;&#10;    member &#61; string&#10;    role   &#61; string&#10;    condition &#61; optional&#40;object&#40;&#123;&#10;      expression  &#61; string&#10;      title       &#61; string&#10;      description &#61; optional&#40;string&#41;&#10;    &#125;&#41;&#41;&#10;  &#125;&#41;&#41;, &#123;&#125;&#41;&#10;&#125;&#41;&#41;">map&#40;object&#40;&#123;&#8230;&#125;&#41;&#41;</code> |  | <code>&#123;&#125;</code> |
-| [notification_config](variables.tf#L204) | GCS Notification configuration. | <code title="object&#40;&#123;&#10;  enabled        &#61; bool&#10;  payload_format &#61; string&#10;  sa_email       &#61; string&#10;  topic_name     &#61; string&#10;  create_topic &#61; optional&#40;object&#40;&#123;&#10;    kms_key_id &#61; optional&#40;string&#41;&#10;  &#125;&#41;&#41;&#10;  event_types        &#61; optional&#40;list&#40;string&#41;&#41;&#10;  custom_attributes  &#61; optional&#40;map&#40;string&#41;&#41;&#10;  object_name_prefix &#61; optional&#40;string&#41;&#10;&#125;&#41;">object&#40;&#123;&#8230;&#125;&#41;</code> |  | <code>null</code> |
+| [notification_config](variables.tf#L204) | GCS Notification configuration. | <code title="object&#40;&#123;&#10;  enabled        &#61; bool&#10;  payload_format &#61; string&#10;  sa_email       &#61; string&#10;  topic_name     &#61; string&#10;  create_topic &#61; optional&#40;object&#40;&#123;&#10;    kms_key_id &#61; optional&#40;string&#41;&#10;  &#125;&#41;, &#123;&#125;&#41;&#10;  event_types        &#61; optional&#40;list&#40;string&#41;&#41;&#10;  custom_attributes  &#61; optional&#40;map&#40;string&#41;&#41;&#10;  object_name_prefix &#61; optional&#40;string&#41;&#10;&#125;&#41;">object&#40;&#123;&#8230;&#125;&#41;</code> |  | <code>null</code> |
 | [objects_to_upload](variables.tf#L221) | Objects to be uploaded to bucket. | <code title="map&#40;object&#40;&#123;&#10;  name                &#61; string&#10;  metadata            &#61; optional&#40;map&#40;string&#41;&#41;&#10;  content             &#61; optional&#40;string&#41;&#10;  source              &#61; optional&#40;string&#41;&#10;  cache_control       &#61; optional&#40;string&#41;&#10;  content_disposition &#61; optional&#40;string&#41;&#10;  content_encoding    &#61; optional&#40;string&#41;&#10;  content_language    &#61; optional&#40;string&#41;&#10;  content_type        &#61; optional&#40;string&#41;&#10;  event_based_hold    &#61; optional&#40;bool&#41;&#10;  temporary_hold      &#61; optional&#40;bool&#41;&#10;  detect_md5hash      &#61; optional&#40;string&#41;&#10;  storage_class       &#61; optional&#40;string&#41;&#10;  kms_key_name        &#61; optional&#40;string&#41;&#10;  customer_encryption &#61; optional&#40;object&#40;&#123;&#10;    encryption_algorithm &#61; optional&#40;string&#41;&#10;    encryption_key       &#61; string&#10;  &#125;&#41;&#41;&#10;&#125;&#41;&#41;">map&#40;object&#40;&#123;&#8230;&#125;&#41;&#41;</code> |  | <code>&#123;&#125;</code> |
 | [prefix](variables.tf#L247) | Optional prefix used to generate the bucket name. | <code>string</code> |  | <code>null</code> |
 | [public_access_prevention](variables.tf#L262) | Prevents public access to the bucket. | <code>string</code> |  | <code>null</code> |
diff --git a/modules/gcs/variables.tf b/modules/gcs/variables.tf
index 2c81dd169..56958721a 100644
--- a/modules/gcs/variables.tf
+++ b/modules/gcs/variables.tf
@@ -210,7 +210,7 @@ variable "notification_config" {
     topic_name     = string
     create_topic = optional(object({
       kms_key_id = optional(string)
-    }))
+    }), {})
     event_types        = optional(list(string))
     custom_attributes  = optional(map(string))
     object_name_prefix = optional(string)