diff --git a/test/units/testsuite-04.sh b/test/units/testsuite-04.sh
index 7521a6d2e5..b5468cbea4 100755
--- a/test/units/testsuite-04.sh
+++ b/test/units/testsuite-04.sh
@@ -93,7 +93,7 @@ cmp /expected /output
 ID=$(systemd-id128 new)
 systemd-cat -t "$ID" bash -c 'echo parent; (echo child) & wait' &
 PID=$!
-wait %%
+wait $PID
 journalctl --sync
 # We can drop this grep when https://github.com/systemd/systemd/issues/13937
 # has a fix.