diff --git a/test/test-network/systemd-networkd-tests.py b/test/test-network/systemd-networkd-tests.py
index 000180dd41..b294621de9 100755
--- a/test/test-network/systemd-networkd-tests.py
+++ b/test/test-network/systemd-networkd-tests.py
@@ -526,7 +526,8 @@ def setup_system_units():
             'ExecStart=',
             f'ExecStart={networkctl_bin} persistent-storage yes',
             'ExecStop=',
-            f'ExecStop={networkctl_bin} persistent-storage no'
+            f'ExecStop={networkctl_bin} persistent-storage no',
+            'Environment=SYSTEMD_LOG_LEVEL=debug' if enable_debug else '',
         ]
     )