diff --git a/src/gardenlinux/s3/s3_artifacts.py b/src/gardenlinux/s3/s3_artifacts.py
index d1bc0d57..07e68bd5 100644
--- a/src/gardenlinux/s3/s3_artifacts.py
+++ b/src/gardenlinux/s3/s3_artifacts.py
@@ -230,6 +230,7 @@ def upload_from_directory(
 
             with artifact.open("rb") as fp:
                 md5sum = file_digest(fp, "md5").hexdigest()
+                fp.seek(0)
                 sha256sum = file_digest(fp, "sha256").hexdigest()
 
             artifact_metadata = {