diff --git a/main.tf b/main.tf
index 2dc21bf..c1ad102 100644
--- a/main.tf
+++ b/main.tf
@@ -50,12 +50,13 @@ module "source_zip_file" {
 # (if build mode is CODEBUILD, LAMBDA, S3) #
 ############################################
 
-resource "aws_s3_bucket_object" "source_zip_file" {
+resource "aws_s3_object" "source_zip_file" {
   count = var.enabled && contains(["CODEBUILD", "LAMBDA", "S3"], var.build_mode) ? 1 : 0
 
   bucket = var.s3_bucket
   key    = contains(["CODEBUILD", "LAMBDA"], var.build_mode) ? "${var.function_name}/${module.source_zip_file.output_sha}/source.zip" : var.s3_key
   source = module.source_zip_file.output_path
+  source_hash = module.source_zip_file.output_base64sha256
 
   lifecycle {
     create_before_destroy = true
@@ -63,7 +64,7 @@ resource "aws_s3_bucket_object" "source_zip_file" {
 }
 
 locals {
-  source_zip_file_s3_key = var.enabled && contains(["CODEBUILD", "LAMBDA", "S3"], var.build_mode) ? aws_s3_bucket_object.source_zip_file[0].key : null
+  source_zip_file_s3_key = var.enabled && contains(["CODEBUILD", "LAMBDA", "S3"], var.build_mode) ? aws_s3_object.source_zip_file[0].key : null
 }
 
 ###############################################