diff --git a/homeassistant/components/api/__init__.py b/homeassistant/components/api/__init__.py
index 6aead6e109f..a1a2d1107b9 100644
--- a/homeassistant/components/api/__init__.py
+++ b/homeassistant/components/api/__init__.py
@@ -270,7 +270,7 @@ class APIEntityStateView(HomeAssistantView):
 
         # Read the state back for our response
         status_code = HTTPStatus.CREATED if is_new_state else HTTPStatus.OK
-        resp = self.json(hass.states.get(entity_id), status_code)
+        resp = self.json(hass.states.get(entity_id).as_dict(), status_code)
 
         resp.headers.add("Location", f"/api/states/{entity_id}")