diff --git a/esphome/components/ltr390/sensor.py b/esphome/components/ltr390/sensor.py
index 068751627f..2ca203502d 100644
--- a/esphome/components/ltr390/sensor.py
+++ b/esphome/components/ltr390/sensor.py
@@ -8,6 +8,7 @@ from esphome.const import (
     CONF_RESOLUTION,
     UNIT_LUX,
     ICON_BRIGHTNESS_5,
+    DEVICE_CLASS_ILLUMINANCE,
 )
 
 CODEOWNERS = ["@sjtrny"]