diff --git a/pkgs/build-support/docker/tarsum.go b/pkgs/build-support/docker/tarsum.go
index 81a3341fff0..ad33bbac75b 100644
--- a/pkgs/build-support/docker/tarsum.go
+++ b/pkgs/build-support/docker/tarsum.go
@@ -9,7 +9,7 @@ import (
 )
 
 func main() {
-	ts, err := tarsum.NewTarSum(os.Stdin, false, tarsum.Version1)
+	ts, err := tarsum.NewTarSum(os.Stdin, true, tarsum.Version1)
 	if err != nil {
 		fmt.Println(err)
 		os.Exit(1)