diff --git a/homeassistant/components/deconz/binary_sensor.py b/homeassistant/components/deconz/binary_sensor.py
index b8af5a2971e..7f77bbb8809 100644
--- a/homeassistant/components/deconz/binary_sensor.py
+++ b/homeassistant/components/deconz/binary_sensor.py
@@ -22,7 +22,7 @@ from homeassistant.components.binary_sensor import (
     BinarySensorEntity,
     BinarySensorEntityDescription,
 )
-from homeassistant.const import ATTR_TEMPERATURE
+from homeassistant.const import ATTR_TEMPERATURE, ENTITY_CATEGORY_DIAGNOSTIC
 from homeassistant.core import callback
 from homeassistant.helpers.dispatcher import async_dispatcher_connect
 
@@ -169,6 +169,7 @@ class DeconzTampering(DeconzDevice, BinarySensorEntity):
 
     TYPE = DOMAIN
 
+    _attr_entity_category = ENTITY_CATEGORY_DIAGNOSTIC
     _attr_device_class = DEVICE_CLASS_TAMPER
 
     def __init__(self, device, gateway):
diff --git a/tests/components/deconz/test_binary_sensor.py b/tests/components/deconz/test_binary_sensor.py
index 96437800773..036e66f6e46 100644
--- a/tests/components/deconz/test_binary_sensor.py
+++ b/tests/components/deconz/test_binary_sensor.py
@@ -17,6 +17,7 @@ from homeassistant.components.deconz.services import SERVICE_DEVICE_REFRESH
 from homeassistant.const import (
     ATTR_DEVICE_CLASS,
     DEVICE_CLASS_TEMPERATURE,
+    ENTITY_CATEGORY_DIAGNOSTIC,
     STATE_OFF,
     STATE_ON,
     STATE_UNAVAILABLE,
@@ -133,6 +134,8 @@ async def test_tampering_sensor(hass, aioclient_mock, mock_deconz_websocket):
     with patch.dict(DECONZ_WEB_REQUEST, data):
         config_entry = await setup_deconz_integration(hass, aioclient_mock)
 
+    ent_reg = er.async_get(hass)
+
     assert len(hass.states.async_all()) == 3
     presence_tamper = hass.states.get("binary_sensor.presence_sensor_tampered")
     assert presence_tamper.state == STATE_OFF
@@ -149,6 +152,10 @@ async def test_tampering_sensor(hass, aioclient_mock, mock_deconz_websocket):
     await hass.async_block_till_done()
 
     assert hass.states.get("binary_sensor.presence_sensor_tampered").state == STATE_ON
+    assert (
+        ent_reg.async_get("binary_sensor.presence_sensor_tampered").entity_category
+        == ENTITY_CATEGORY_DIAGNOSTIC
+    )
 
     await hass.config_entries.async_unload(config_entry.entry_id)