diff --git a/drivers/sensors/ds18b20.c b/drivers/sensors/ds18b20.c
index fdb521d767..8716a17eae 100644
--- a/drivers/sensors/ds18b20.c
+++ b/drivers/sensors/ds18b20.c
@@ -286,7 +286,7 @@ static int ds18b20_isalarm(FAR struct onewire_master_s *master,
   alarm.romcode = config->romcode;
   alarm.isalarm = false;
 
-  ret = onewire_search(master, config->family, true, ds18b20_alarm_cb,
+  ret = onewire_search(master, DS18B20_DEVICE_FAMILY, true, ds18b20_alarm_cb,
                        &alarm);
   if (ret > 0)
     {
@@ -935,7 +935,6 @@ int ds18b20_register(int devno, FAR struct onewire_master_s *onewire,
 
   priv->master           = onewire;
   priv->config.romcode   = romcode;
-  priv->config.family    = DS18B20_DEVICE_FAMILY;
   priv->reg.res          = DS18B20_RES_CONV(DS18B20_RESMAX);
   priv->reg.alarm.thigh  = DS18B20_TALARM_MAX;
   priv->reg.alarm.tlow   = DS18B20_TALARM_MIN;
diff --git a/include/nuttx/1wire/1wire_master.h b/include/nuttx/1wire/1wire_master.h
index 77187e2f93..c4fd342748 100644
--- a/include/nuttx/1wire/1wire_master.h
+++ b/include/nuttx/1wire/1wire_master.h
@@ -39,7 +39,6 @@ struct onewire_master_s;
 
 struct onewire_config_s
 {
-  uint8_t  family;                  /* Device family identifier */
   uint64_t romcode;                 /* Unique device identifier */
 };