diff --git a/homeassistant/components/homeassistant/triggers/time.py b/homeassistant/components/homeassistant/triggers/time.py
index 1bfdc0e4e58..49a42d3843d 100644
--- a/homeassistant/components/homeassistant/triggers/time.py
+++ b/homeassistant/components/homeassistant/triggers/time.py
@@ -128,7 +128,7 @@ async def async_attach_trigger(hass, config, action, automation_info):
         elif (
             new_state.domain == "sensor"
             and new_state.attributes.get(ATTR_DEVICE_CLASS)
-            == sensor.DEVICE_CLASS_TIMESTAMP
+            == sensor.SensorDeviceClass.TIMESTAMP
             and new_state.state not in (STATE_UNAVAILABLE, STATE_UNKNOWN)
         ):
             trigger_dt = dt_util.parse_datetime(new_state.state)