diff --git a/homeassistant/components/notion/__init__.py b/homeassistant/components/notion/__init__.py
index 88da19f5ab2..87871ce5f3c 100644
--- a/homeassistant/components/notion/__init__.py
+++ b/homeassistant/components/notion/__init__.py
@@ -230,10 +230,10 @@ class NotionEntity(CoordinatorEntity):
         device_registry = await dr.async_get_registry(self.hass)
         bridge = self.coordinator.data["bridges"][self._bridge_id]
         bridge_device = device_registry.async_get_device(
-            {DOMAIN: bridge["hardware_id"]}, set()
+            {(DOMAIN, bridge["hardware_id"])}, set()
         )
         this_device = device_registry.async_get_device(
-            {DOMAIN: sensor["hardware_id"]}, set()
+            {(DOMAIN, sensor["hardware_id"])}, set()
         )
 
         device_registry.async_update_device(