diff --git a/test/test-network-generator-conversion.sh b/test/test-network-generator-conversion.sh
index f03847c1fa..6224a4d04f 100755
--- a/test/test-network-generator-conversion.sh
+++ b/test/test-network-generator-conversion.sh
@@ -307,5 +307,5 @@ INVALID_COMMAND_LINES=(
     "ip=:::::dhcp99:dhcp6:10.0.0.128:[fdef:c400:bd01:1096::bbbb]:"
 )
 for cmdline in "${INVALID_COMMAND_LINES[@]}"; do
-    (! SYSTEMD_LOG_LEVEL=debug SYSTEMD_PROC_CMDLINE="$cmdline" "$GENERATOR_BIN")
+    (! SYSTEMD_LOG_LEVEL=debug SYSTEMD_PROC_CMDLINE="$cmdline" "$GENERATOR_BIN" --root "$WORK_DIR")
 done