diff --git a/role.tf b/role.tf
index b496f01..3ea54f3 100644
--- a/role.tf
+++ b/role.tf
@@ -78,7 +78,7 @@ data "aws_iam_policy_document" "lambda_policy" {
       "dynamodb:Scan",
       "dynamodb:UpdateItem",
     ]
-    resources = [var.create ? aws_dynamodb_table.table[0].arn : null]
+    resources = [var.create ? aws_dynamodb_table.table[0].arn : ""]
   }
   dynamic "statement" {
     for_each = var.create && var.enable_sns ? toset(["1"]) : toset([])
diff --git a/sns.tf b/sns.tf
index 748db6a..4a8e744 100644
--- a/sns.tf
+++ b/sns.tf
@@ -40,6 +40,6 @@ data "aws_iam_policy_document" "topic" {
       variable = "AWS:SourceOwner"
       values   = [local.account_id]
     }
-    resources = [var.create && var.enable_sns ? aws_sns_topic.topic[0].arn : null]
+    resources = [var.create && var.enable_sns ? aws_sns_topic.topic[0].arn : ""]
   }
 }