diff --git a/pkg/s3/types.go b/pkg/s3/types.go
index 06069f5..20f0c5b 100644
--- a/pkg/s3/types.go
+++ b/pkg/s3/types.go
@@ -248,11 +248,13 @@ func (s *S3Service) Stat(ctx context.Context, blobPath string) (int64, error) {
 // PutBytes uploads data to blobPath with the given content type.
 func (s *S3Service) PutBytes(ctx context.Context, blobPath string, data []byte, contentType string) error {
 	key := s.s3Key(blobPath)
+	contentLength := int64(len(data))
 	_, err := s.Client.PutObject(ctx, &awss3.PutObjectInput{
-		Bucket:      &s.Bucket,
-		Key:         &key,
-		Body:        bytes.NewReader(data),
-		ContentType: &contentType,
+		Bucket:        &s.Bucket,
+		Key:           &key,
+		Body:          bytes.NewReader(data),
+		ContentType:   &contentType,
+		ContentLength: &contentLength,
 	})
 	return err
 }