diff --git a/test/test-network/systemd-networkd-tests.py b/test/test-network/systemd-networkd-tests.py
index 6477510e11..3cd2838cad 100755
--- a/test/test-network/systemd-networkd-tests.py
+++ b/test/test-network/systemd-networkd-tests.py
@@ -8630,7 +8630,6 @@ class NetworkdDHCPClientTests(unittest.TestCase, Utilities):
 
         start_networkd()
         self.wait_online('veth-peer:carrier')
-        masq = lambda bs: ':'.join(f'{b:02x}' for b in bs)
         start_dnsmasq('--dhcp-option=114,http://|invalid/url',
                       '--dhcp-option=option6:103,http://|invalid/url')