diff --git a/homeassistant/components/dsmr/sensor.py b/homeassistant/components/dsmr/sensor.py
index 82a81118dbd..253e8409f1b 100644
--- a/homeassistant/components/dsmr/sensor.py
+++ b/homeassistant/components/dsmr/sensor.py
@@ -4,6 +4,9 @@ from datetime import timedelta
 from functools import partial
 import logging
 
+from dsmr_parser import obis_references as obis_ref
+from dsmr_parser.clients.protocol import create_dsmr_reader, create_tcp_dsmr_reader
+import serial
 import voluptuous as vol
 
 from homeassistant.components.sensor import PLATFORM_SCHEMA
@@ -52,10 +55,6 @@ async def async_setup_platform(hass, config, async_add_entities, discovery_info=
     # Suppress logging
     logging.getLogger("dsmr_parser").setLevel(logging.ERROR)
 
-    from dsmr_parser import obis_references as obis_ref
-    from dsmr_parser.clients.protocol import create_dsmr_reader, create_tcp_dsmr_reader
-    import serial
-
     dsmr_version = config[CONF_DSMR_VERSION]
 
     # Define list of name,obis mappings to generate entities
@@ -212,11 +211,9 @@ class DSMREntity(Entity):
     @property
     def state(self):
         """Return the state of sensor, if available, translate if needed."""
-        from dsmr_parser import obis_references as obis
-
         value = self.get_dsmr_object_attr("value")
 
-        if self._obis == obis.ELECTRICITY_ACTIVE_TARIFF:
+        if self._obis == obis_ref.ELECTRICITY_ACTIVE_TARIFF:
             return self.translate_tariff(value)
 
         try:
diff --git a/tests/components/dsmr/test_sensor.py b/tests/components/dsmr/test_sensor.py
index 57dfa183feb..195345dd489 100644
--- a/tests/components/dsmr/test_sensor.py
+++ b/tests/components/dsmr/test_sensor.py
@@ -11,9 +11,11 @@ from decimal import Decimal
 from unittest.mock import Mock
 
 import asynctest
+import pytest
+
 from homeassistant.bootstrap import async_setup_component
 from homeassistant.components.dsmr.sensor import DerivativeDSMREntity
-import pytest
+
 from tests.common import assert_setup_component
 
 
@@ -34,10 +36,11 @@ def mock_connection_factory(monkeypatch):
 
     # apply the mock to both connection factories
     monkeypatch.setattr(
-        "dsmr_parser.clients.protocol.create_dsmr_reader", connection_factory
+        "homeassistant.components.dsmr.sensor.create_dsmr_reader", connection_factory
     )
     monkeypatch.setattr(
-        "dsmr_parser.clients.protocol.create_tcp_dsmr_reader", connection_factory
+        "homeassistant.components.dsmr.sensor.create_tcp_dsmr_reader",
+        connection_factory,
     )
 
     return connection_factory, transport, protocol
@@ -158,7 +161,8 @@ def test_connection_errors_retry(hass, monkeypatch, mock_connection_factory):
     )
 
     monkeypatch.setattr(
-        "dsmr_parser.clients.protocol.create_dsmr_reader", first_fail_connection_factory
+        "homeassistant.components.dsmr.sensor.create_dsmr_reader",
+        first_fail_connection_factory,
     )
     yield from async_setup_component(hass, "sensor", {"sensor": config})