diff --git a/lambda.tf b/lambda.tf
index 3ff62c4..effd370 100644
--- a/lambda.tf
+++ b/lambda.tf
@@ -23,7 +23,11 @@ resource "aws_lambda_function" "lambda" {
   environment {
     variables = merge(
       local.lambda_environment_variables,
-      tomap({ "tf_module_version" = local._module_version }),
+      {
+        "tf_module_version" = local._module_version
+        SnsEnable           = var.create && var.enable_sns
+        SnsTopicArn         = var.create && var.enable_sns ? aws_sns_topic.topic[0].arn : null
+      }
     )
   }
   timeouts {}