diff --git a/homeassistant/components/nest/legacy/climate.py b/homeassistant/components/nest/legacy/climate.py
index 13728585e39..de6bd0e3b26 100644
--- a/homeassistant/components/nest/legacy/climate.py
+++ b/homeassistant/components/nest/legacy/climate.py
@@ -97,7 +97,7 @@ class NestThermostat(ClimateEntity):
         self._fan_modes = [FAN_ON, FAN_AUTO]
 
         # Set the default supported features
-        self._support_flags = (
+        self._attr_supported_features = (
             ClimateEntityFeature.TARGET_TEMPERATURE | ClimateEntityFeature.PRESET_MODE
         )
 
@@ -106,7 +106,9 @@ class NestThermostat(ClimateEntity):
 
         if self.device.can_heat and self.device.can_cool:
             self._operation_list.append(HVACMode.AUTO)
-            self._support_flags |= ClimateEntityFeature.TARGET_TEMPERATURE_RANGE
+            self._attr_supported_features |= (
+                ClimateEntityFeature.TARGET_TEMPERATURE_RANGE
+            )
 
         # Add supported nest thermostat features
         if self.device.can_heat:
@@ -120,7 +122,7 @@ class NestThermostat(ClimateEntity):
         # feature of device
         self._has_fan = self.device.has_fan
         if self._has_fan:
-            self._support_flags |= ClimateEntityFeature.FAN_MODE
+            self._attr_supported_features |= ClimateEntityFeature.FAN_MODE
 
         # data attributes
         self._away = None
@@ -150,11 +152,6 @@ class NestThermostat(ClimateEntity):
             async_dispatcher_connect(self.hass, SIGNAL_NEST_UPDATE, async_update_state)
         )
 
-    @property
-    def supported_features(self):
-        """Return the list of supported features."""
-        return self._support_flags
-
     @property
     def unique_id(self):
         """Return unique ID for this device."""