diff --git a/src/network/networkd-network-gperf.gperf b/src/network/networkd-network-gperf.gperf
index bf91f2c4c1..83ef927b8b 100644
--- a/src/network/networkd-network-gperf.gperf
+++ b/src/network/networkd-network-gperf.gperf
@@ -599,7 +599,7 @@ Network.DHCPv6PrefixDelegation,              config_parse_tristate,
 IPv6PrefixDelegation.RouterLifetimeSec,      config_parse_sec,                                         0,                             offsetof(Network, router_lifetime_usec)
 IPv6PrefixDelegation.Managed,                config_parse_bool,                                        0,                             offsetof(Network, router_managed)
 IPv6PrefixDelegation.OtherInformation,       config_parse_bool,                                        0,                             offsetof(Network, router_other_information)
-IPv6PrefixDelegation.RouterPreference,       config_parse_router_preference,                           0,                             0
+IPv6PrefixDelegation.RouterPreference,       config_parse_router_preference,                           0,                             offsetof(Network, router_preference)
 IPv6PrefixDelegation.EmitDNS,                config_parse_bool,                                        0,                             offsetof(Network, router_emit_dns)
 IPv6PrefixDelegation.DNS,                    config_parse_radv_dns,                                    0,                             0
 IPv6PrefixDelegation.EmitDomains,            config_parse_bool,                                        0,                             offsetof(Network, router_emit_domains)
diff --git a/test/fuzz/fuzz-network-parser/oss-fuzz-391916479 b/test/fuzz/fuzz-network-parser/oss-fuzz-391916479
new file mode 100644
index 0000000000..b918d26abe
Binary files /dev/null and b/test/fuzz/fuzz-network-parser/oss-fuzz-391916479 differ