diff --git a/variables.tf b/variables.tf
index 1c8f442..4049e6e 100644
--- a/variables.tf
+++ b/variables.tf
@@ -307,6 +307,22 @@ variable "glue_create_config" {
     filter_policy_scope           = string // sns subcription filter policy scope
   })
   description = "Configuration of glue-create lambda"
+  default = {
+    athena_workgroup_name         = ""
+    athena_data_source            = ""
+    athena_bucket_name            = ""
+    lambda_s3_key                 = ""
+    lambda_s3_bucket              = ""
+    lambda_function_name          = ""
+    path_regex                    = ""
+    sns_topic_arn                 = ""
+    sqs_queue_name                = ""
+    sqs_queue_name_dl             = ""
+    iam_role_name                 = ""
+    iam_policy_name               = ""
+    sns_subcription_filter_policy = ""
+    filter_policy_scope           = ""
+  }
 }
 
 variable "enable_glue_sync" {
@@ -330,6 +346,19 @@ variable "glue_sync_config" {
     filter_policy_scope           = string // sns subcription filter policy scope
   })
   description = "Configuration of glue-sync lambda"
+  default = {
+    lambda_s3_key                 = ""
+    lambda_s3_bucket              = ""
+    lambda_function_name          = ""
+    path_regex                    = ""
+    sns_topic_arn                 = ""
+    sqs_queue_name                = ""
+    sqs_queue_name_dl             = ""
+    iam_role_name                 = ""
+    iam_policy_name               = ""
+    sns_subcription_filter_policy = ""
+    filter_policy_scope           = ""
+  }
 }
 
 variable "group_event_lambda_batch_size" {