diff --git a/ports/espressif/common-hal/wifi/Radio.c b/ports/espressif/common-hal/wifi/Radio.c
index 698da291e7..545af1d6cb 100644
--- a/ports/espressif/common-hal/wifi/Radio.c
+++ b/ports/espressif/common-hal/wifi/Radio.c
@@ -139,14 +139,14 @@ void common_hal_wifi_radio_set_mac_address(wifi_radio_obj_t *self, const uint8_t
     esp_wifi_set_mac(ESP_IF_WIFI_STA, mac);
 }
 
-uint8_t common_hal_wifi_radio_get_tx_power(wifi_radio_obj_t *self) {
+mp_float_t common_hal_wifi_radio_get_tx_power(wifi_radio_obj_t *self) {
     int8_t tx_power;
     esp_wifi_get_max_tx_power(&tx_power);
-    return tx_power / 4;
+    return tx_power / 4.0f;
 }
 
-void common_hal_wifi_radio_set_tx_power(wifi_radio_obj_t *self, const uint8_t tx_power) {
-    esp_wifi_set_max_tx_power(tx_power * 4);
+void common_hal_wifi_radio_set_tx_power(wifi_radio_obj_t *self, const mp_float_t tx_power) {
+    esp_wifi_set_max_tx_power(tx_power * 4.0f);
 }
 
 mp_obj_t common_hal_wifi_radio_get_mac_address_ap(wifi_radio_obj_t *self) {
diff --git a/shared-bindings/wifi/Radio.c b/shared-bindings/wifi/Radio.c
index a0a4df2548..bcd998d806 100644
--- a/shared-bindings/wifi/Radio.c
+++ b/shared-bindings/wifi/Radio.c
@@ -138,17 +138,17 @@ MP_PROPERTY_GETSET(wifi_radio_mac_address_obj,
     (mp_obj_t)&wifi_radio_get_mac_address_obj,
     (mp_obj_t)&wifi_radio_set_mac_address_obj);
 
-//|     tx_power: int
+//|     tx_power: float
 //|     """Wifi transmission power, in dBm."""
 //|
 STATIC mp_obj_t wifi_radio_get_tx_power(mp_obj_t self_in) {
     wifi_radio_obj_t *self = MP_OBJ_TO_PTR(self_in);
-    return mp_obj_new_int(common_hal_wifi_radio_get_tx_power(self));
+    return mp_obj_new_float(common_hal_wifi_radio_get_tx_power(self));
 }
 MP_DEFINE_CONST_FUN_OBJ_1(wifi_radio_get_tx_power_obj, wifi_radio_get_tx_power);
 
 STATIC mp_obj_t wifi_radio_set_tx_power(mp_obj_t self_in, mp_obj_t tx_power_in) {
-    mp_int_t tx_power = mp_obj_get_int(tx_power_in);
+    mp_float_t tx_power = mp_obj_get_float(tx_power_in);
     wifi_radio_obj_t *self = MP_OBJ_TO_PTR(self_in);
     common_hal_wifi_radio_set_tx_power(self, tx_power);
     return mp_const_none;
diff --git a/shared-bindings/wifi/Radio.h b/shared-bindings/wifi/Radio.h
index e89e22ebe9..312e9e5395 100644
--- a/shared-bindings/wifi/Radio.h
+++ b/shared-bindings/wifi/Radio.h
@@ -82,8 +82,8 @@ extern void common_hal_wifi_radio_set_mac_address(wifi_radio_obj_t *self, const
 extern mp_obj_t common_hal_wifi_radio_get_mac_address_ap(wifi_radio_obj_t *self);
 extern void common_hal_wifi_radio_set_mac_address_ap(wifi_radio_obj_t *self, const uint8_t *mac);
 
-extern uint8_t common_hal_wifi_radio_get_tx_power(wifi_radio_obj_t *self);
-extern void common_hal_wifi_radio_set_tx_power(wifi_radio_obj_t *self, const uint8_t power);
+extern mp_float_t common_hal_wifi_radio_get_tx_power(wifi_radio_obj_t *self);
+extern void common_hal_wifi_radio_set_tx_power(wifi_radio_obj_t *self, const mp_float_t power);
 
 extern mp_obj_t common_hal_wifi_radio_start_scanning_networks(wifi_radio_obj_t *self);
 extern void common_hal_wifi_radio_stop_scanning_networks(wifi_radio_obj_t *self);