diff --git a/homeassistant/components/modern_forms/sensor.py b/homeassistant/components/modern_forms/sensor.py
index 5c9e0a18575..6d2ef5b6dab 100644
--- a/homeassistant/components/modern_forms/sensor.py
+++ b/homeassistant/components/modern_forms/sensor.py
@@ -3,9 +3,8 @@ from __future__ import annotations
 
 from datetime import datetime
 
-from homeassistant.components.sensor import SensorEntity
+from homeassistant.components.sensor import SensorDeviceClass, SensorEntity
 from homeassistant.config_entries import ConfigEntry
-from homeassistant.const import DEVICE_CLASS_TIMESTAMP
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 from homeassistant.helpers.typing import StateType
@@ -70,7 +69,7 @@ class ModernFormsLightTimerRemainingTimeSensor(ModernFormsSensor):
             key="light_timer_remaining_time",
             name=f"{coordinator.data.info.device_name} Light Sleep Time",
         )
-        self._attr_device_class = DEVICE_CLASS_TIMESTAMP
+        self._attr_device_class = SensorDeviceClass.TIMESTAMP
 
     @property
     def native_value(self) -> StateType | datetime:
@@ -100,7 +99,7 @@ class ModernFormsFanTimerRemainingTimeSensor(ModernFormsSensor):
             key="fan_timer_remaining_time",
             name=f"{coordinator.data.info.device_name} Fan Sleep Time",
         )
-        self._attr_device_class = DEVICE_CLASS_TIMESTAMP
+        self._attr_device_class = SensorDeviceClass.TIMESTAMP
 
     @property
     def native_value(self) -> StateType | datetime: