diff --git a/test/units/testsuite-04.sh b/test/units/testsuite-04.sh
index 265f7d9306..52a3f7776b 100755
--- a/test/units/testsuite-04.sh
+++ b/test/units/testsuite-04.sh
@@ -14,6 +14,7 @@ done
 journalctl --rotate
 journalctl --flush
 journalctl --sync
+journalctl --rotate --vacuum-size=8M
 
 # Reset the ratelimit buckets for the subsequent tests below.
 systemctl restart systemd-journald