diff --git a/homeassistant/components/xiaomi_miio/entity.py b/homeassistant/components/xiaomi_miio/entity.py
index 7f769ab56562..45929fc5981e 100644
--- a/homeassistant/components/xiaomi_miio/entity.py
+++ b/homeassistant/components/xiaomi_miio/entity.py
@@ -176,7 +176,11 @@ class XiaomiGatewayDevice(CoordinatorEntity[GatewayDeviceCoordinator], Entity):
             assert self._entry.unique_id is not None
         return DeviceInfo(
             identifiers={(DOMAIN, self._sub_device.sid)},
-            via_device=(DOMAIN, self._entry.unique_id),
+            via_device_id=dr.async_get_device_id_by_identifier(
+                self.hass,
+                (DOMAIN, self._entry.unique_id),
+                config_entry_id=self._entry.entry_id,
+            ),
             manufacturer="Xiaomi",
             name=self._sub_device.name,
             model=self._sub_device.model,
diff --git a/tests/components/xiaomi_miio/test_entity.py b/tests/components/xiaomi_miio/test_entity.py
new file mode 100644
index 000000000000..086d50af1809
--- /dev/null
+++ b/tests/components/xiaomi_miio/test_entity.py
@@ -0,0 +1,44 @@
+"""The tests for the xiaomi_miio entity base classes."""
+
+from unittest.mock import Mock
+
+from homeassistant.components.xiaomi_miio.const import DOMAIN
+from homeassistant.components.xiaomi_miio.coordinator import GatewayDeviceCoordinator
+from homeassistant.components.xiaomi_miio.entity import XiaomiGatewayDevice
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers import device_registry as dr
+
+from . import TEST_MAC
+
+from tests.common import MockConfigEntry
+
+
+async def test_gateway_sub_device_via_device_id(
+    hass: HomeAssistant, device_registry: dr.DeviceRegistry
+) -> None:
+    """Test a gateway sub device links to the gateway device via via_device_id."""
+    config_entry = MockConfigEntry(domain=DOMAIN, unique_id=TEST_MAC)
+    config_entry.add_to_hass(hass)
+
+    gateway_device = device_registry.async_get_or_create(
+        config_entry_id=config_entry.entry_id,
+        identifiers={(DOMAIN, TEST_MAC)},
+        manufacturer="Xiaomi",
+        name="Test Gateway",
+    )
+
+    sub_device = Mock(
+        sid="158d0001d7c95a",
+        model="lumi.sensor_ht",
+        firmware_version="1.2",
+        zigbee_model="lumi.sensor_ht.v1",
+    )
+    sub_device.name = "Sub Device"
+
+    coordinator = GatewayDeviceCoordinator(hass, config_entry, sub_device)
+    entity = XiaomiGatewayDevice(coordinator)
+    entity.hass = hass
+
+    device_info = entity.device_info
+
+    assert device_info["via_device_id"] == gateway_device.id