diff --git a/src/libsystemd-network/sd-dhcp-client.c b/src/libsystemd-network/sd-dhcp-client.c
index 4b1cdd0b86..6b6a5ded42 100644
--- a/src/libsystemd-network/sd-dhcp-client.c
+++ b/src/libsystemd-network/sd-dhcp-client.c
@@ -1020,8 +1020,7 @@ static int client_append_common_discover_request_options(sd_dhcp_client *client,
         if (client->user_class) {
                 r = dhcp_option_append(&packet->dhcp, optlen, optoffset, 0,
                                        SD_DHCP_OPTION_USER_CLASS,
-                                       strv_length(client->user_class),
-                                       client->user_class);
+                                       /* optlen= */ 0, client->user_class);
                 if (r < 0)
                         return r;
         }
@@ -1037,7 +1036,7 @@ static int client_append_common_discover_request_options(sd_dhcp_client *client,
                 r = dhcp_option_append(
                                 &packet->dhcp, optlen, optoffset, 0,
                                 SD_DHCP_OPTION_VENDOR_SPECIFIC,
-                                ordered_hashmap_size(client->vendor_options), client->vendor_options);
+                                /* optlen= */ 0, client->vendor_options);
                 if (r < 0)
                         return r;
         }
diff --git a/src/libsystemd-network/sd-dhcp-server.c b/src/libsystemd-network/sd-dhcp-server.c
index d1fe0e2273..d88480a346 100644
--- a/src/libsystemd-network/sd-dhcp-server.c
+++ b/src/libsystemd-network/sd-dhcp-server.c
@@ -719,7 +719,7 @@ static int server_send_offer_or_ack(
                 r = dhcp_option_append(
                                 &packet->dhcp, req->max_optlen, &offset, 0,
                                 SD_DHCP_OPTION_VENDOR_SPECIFIC,
-                                ordered_set_size(server->vendor_options), server->vendor_options);
+                                /* optlen= */ 0, server->vendor_options);
                 if (r < 0)
                         return r;
         }