diff --git a/test/testscript b/test/testscript
index b0eddb5..832856d 100644
--- a/test/testscript
+++ b/test/testscript
@@ -17,7 +17,6 @@ umount /mnt
 cat >>/usr/bin/combustion-validate <<'EOF'
 #!/bin/bash
 set -euxo pipefail
-exec &>/dev/ttyS0
 trap '[ $? -eq 0 ] || poweroff -f' EXIT
 # Print a list of files which have SELinux label mismatches
 if restorecon -nvR -e /.snapshots -e /run / | grep -v wtmpdb | grep "Would relabel"; then
@@ -33,6 +32,8 @@ chmod a+x /usr/bin/combustion-validate
 
 cat >>/etc/systemd/system/combustion-validate.service <<'EOF'
 [Service]
+Type=oneshot
+StandardOutput=journal+console
 ExecStart=/usr/bin/combustion-validate
 [Install]
 RequiredBy=default.target