diff --git a/homeassistant/components/dsmr/sensor.py b/homeassistant/components/dsmr/sensor.py
index 79136a27f1624..56e0af1823ed9 100644
--- a/homeassistant/components/dsmr/sensor.py
+++ b/homeassistant/components/dsmr/sensor.py
@@ -353,6 +353,7 @@ class DSMRSensorEntityDescription(SensorEntityDescription):
         obis_reference=obis_references.BELGIUM_CURRENT_AVERAGE_DEMAND,
         dsmr_versions={"5B"},
         device_class=SensorDeviceClass.POWER,
+        state_class=SensorStateClass.MEASUREMENT,
     ),
     DSMRSensorEntityDescription(
         key="belgium_maximum_demand_current_month",
@@ -360,6 +361,7 @@ class DSMRSensorEntityDescription(SensorEntityDescription):
         obis_reference=obis_references.BELGIUM_MAXIMUM_DEMAND_MONTH,
         dsmr_versions={"5B"},
         device_class=SensorDeviceClass.POWER,
+        state_class=SensorStateClass.MEASUREMENT,
     ),
     DSMRSensorEntityDescription(
         key="hourly_gas_meter_reading",
diff --git a/tests/components/dsmr/test_sensor.py b/tests/components/dsmr/test_sensor.py
index 419b562f431a6..c819fa0895583 100644
--- a/tests/components/dsmr/test_sensor.py
+++ b/tests/components/dsmr/test_sensor.py
@@ -614,7 +614,7 @@ async def test_belgian_meter(hass: HomeAssistant, dsmr_connection_fixture) -> No
     avg_demand = hass.states.get("sensor.electricity_meter_current_average_demand")
     assert avg_demand.state == "1.75"
     assert avg_demand.attributes.get(ATTR_UNIT_OF_MEASUREMENT) == UnitOfPower.KILO_WATT
-    assert avg_demand.attributes.get(ATTR_STATE_CLASS) is None
+    assert avg_demand.attributes.get(ATTR_STATE_CLASS) == SensorStateClass.MEASUREMENT
 
     # check max average demand is parsed correctly
     max_demand = hass.states.get(
@@ -622,7 +622,7 @@ async def test_belgian_meter(hass: HomeAssistant, dsmr_connection_fixture) -> No
     )
     assert max_demand.state == "4.11"
     assert max_demand.attributes.get(ATTR_UNIT_OF_MEASUREMENT) == UnitOfPower.KILO_WATT
-    assert max_demand.attributes.get(ATTR_STATE_CLASS) is None
+    assert max_demand.attributes.get(ATTR_STATE_CLASS) == SensorStateClass.MEASUREMENT
 
     # check if gas consumption mbus1 is parsed correctly
     gas_consumption = hass.states.get("sensor.gas_meter_gas_consumption")