diff --git a/builder/image.d/uuid_hash b/builder/image.d/uuid_hash
index 56dc3ab..75cbc36 100755
--- a/builder/image.d/uuid_hash
+++ b/builder/image.d/uuid_hash
@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
 set -Eeufo pipefail
 
-hash=$(sha256sum)
+hash=$(openssl dgst -sha256 -r)
 echo "${hash:0:8}-${hash:8:4}-${hash:12:4}-${hash:16:4}-${hash:20:12}"