diff --git a/homeassistant/components/template/sensor.py b/homeassistant/components/template/sensor.py
index 9714d147e01..a5f5d669b16 100644
--- a/homeassistant/components/template/sensor.py
+++ b/homeassistant/components/template/sensor.py
@@ -5,6 +5,7 @@ import voluptuous as vol
 
 from homeassistant.components.sensor import (
     DEVICE_CLASSES_SCHEMA,
+    DOMAIN as SENSOR_DOMAIN,
     ENTITY_ID_FORMAT,
     PLATFORM_SCHEMA,
     SensorEntity,
@@ -201,6 +202,7 @@ class SensorTemplate(TemplateEntity, SensorEntity):
 class TriggerSensorEntity(TriggerEntity, SensorEntity):
     """Sensor entity based on trigger data."""
 
+    domain = SENSOR_DOMAIN
     extra_template_keys = (CONF_VALUE_TEMPLATE,)
 
     @property
diff --git a/tests/components/template/test_sensor.py b/tests/components/template/test_sensor.py
index 11945a3b027..6aa1e75cc1f 100644
--- a/tests/components/template/test_sensor.py
+++ b/tests/components/template/test_sensor.py
@@ -1014,7 +1014,15 @@ async def test_trigger_entity(hass):
                             "attribute_templates": {
                                 "plus_one": "{{ trigger.event.data.beer + 1 }}"
                             },
-                        }
+                        },
+                    },
+                },
+                {
+                    "trigger": [],
+                    "sensors": {
+                        "bare_minimum": {
+                            "value_template": "{{ trigger.event.data.beer }}"
+                        },
                     },
                 },
             ],
@@ -1027,6 +1035,10 @@ async def test_trigger_entity(hass):
     assert state is not None
     assert state.state == STATE_UNKNOWN
 
+    state = hass.states.get("sensor.bare_minimum")
+    assert state is not None
+    assert state.state == STATE_UNKNOWN
+
     context = Context()
     hass.bus.async_fire("test_event", {"beer": 2}, context=context)
     await hass.async_block_till_done()