diff --git a/homeassistant/components/zamg/weather.py b/homeassistant/components/zamg/weather.py
index 2bf4a5b39f6..6910955fcf7 100644
--- a/homeassistant/components/zamg/weather.py
+++ b/homeassistant/components/zamg/weather.py
@@ -18,7 +18,7 @@ from homeassistant.const import (
     CONF_LATITUDE,
     CONF_LONGITUDE,
     CONF_NAME,
-    LENGTH_MILLIMETERS,
+    PRESSURE_HPA,
     SPEED_KILOMETERS_PER_HOUR,
     TEMP_CELSIUS,
 )
@@ -87,9 +87,7 @@ def setup_platform(
 class ZamgWeather(WeatherEntity):
     """Representation of a weather condition."""
 
-    _attr_native_pressure_unit = (
-        LENGTH_MILLIMETERS  # API reports l/m², equivalent to mm
-    )
+    _attr_native_pressure_unit = PRESSURE_HPA
     _attr_native_temperature_unit = TEMP_CELSIUS
     _attr_native_wind_speed_unit = SPEED_KILOMETERS_PER_HOUR