diff --git a/test/test-functions b/test/test-functions
index 6db79bd416..1ee41b636d 100644
--- a/test/test-functions
+++ b/test/test-functions
@@ -1653,7 +1653,7 @@ create_empty_image() {
     sfdisk "$LOOPDEV" <<EOF
 label: gpt
 type=C12A7328-F81F-11D2-BA4B-00A0C93EC93B name=esp  size=${esp_size}M
-type=0FC63DAF-8483-4772-8E79-3D69D8477DE4 name=root size=${root_size}M bootable
+type=$(systemd-id128 show root -Pu) name=root size=${root_size}M bootable
 type=BC13C2FF-59E6-4262-A352-B275FD6F7172 name=boot size=${boot_size}M
 type=0FC63DAF-8483-4772-8E79-3D69D8477DE4 name=data
 EOF