diff --git a/homeassistant/components/bme280/sensor.py b/homeassistant/components/bme280/sensor.py
index ee4e1731156..b9bc18e6abf 100644
--- a/homeassistant/components/bme280/sensor.py
+++ b/homeassistant/components/bme280/sensor.py
@@ -3,6 +3,9 @@ from datetime import timedelta
 from functools import partial
 import logging
 
+import smbus  # pylint: disable=import-error
+from i2csense.bme280 import BME280  # pylint: disable=import-error
+
 import voluptuous as vol
 
 from homeassistant.components.sensor import PLATFORM_SCHEMA
@@ -76,8 +79,6 @@ PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
 
 async def async_setup_platform(hass, config, async_add_entities, discovery_info=None):
     """Set up the BME280 sensor."""
-    import smbus  # pylint: disable=import-error
-    from i2csense.bme280 import BME280  # pylint: disable=import-error
 
     SENSOR_TYPES[SENSOR_TEMP][1] = hass.config.units.temperature_unit
     name = config.get(CONF_NAME)