diff --git a/esphome/components/wifi_signal/sensor.py b/esphome/components/wifi_signal/sensor.py
index f2a9f5408c..891d95d33e 100644
--- a/esphome/components/wifi_signal/sensor.py
+++ b/esphome/components/wifi_signal/sensor.py
@@ -5,7 +5,7 @@ from esphome.const import (
     CONF_ID,
     DEVICE_CLASS_SIGNAL_STRENGTH,
     ICON_EMPTY,
-    UNIT_DECIBEL,
+    UNIT_DECIBEL_MILLIWATT,
 )
 
 DEPENDENCIES = ["wifi"]
@@ -15,7 +15,9 @@ WiFiSignalSensor = wifi_signal_ns.class_(
 )
 
 CONFIG_SCHEMA = (
-    sensor.sensor_schema(UNIT_DECIBEL, ICON_EMPTY, 0, DEVICE_CLASS_SIGNAL_STRENGTH)
+    sensor.sensor_schema(
+        UNIT_DECIBEL_MILLIWATT, ICON_EMPTY, 0, DEVICE_CLASS_SIGNAL_STRENGTH
+    )
     .extend(
         {
             cv.GenerateID(): cv.declare_id(WiFiSignalSensor),