diff --git a/search/src/orrery_search/routers/observer.py b/search/src/orrery_search/routers/observer.py
index 44d6ae1..5660748 100644
--- a/search/src/orrery_search/routers/observer.py
+++ b/search/src/orrery_search/routers/observer.py
@@ -31,8 +31,8 @@ def _client_ip(request: Request) -> str | None:
     return request.client.host if request.client else None
 
 
-@router.get("/geolocate")
-def geolocate(request: Request) -> GeolocateOut | Response:
+@router.get("/geolocate", response_model=GeolocateOut, responses={204: {}})
+def geolocate(request: Request):
     """Return approximate location from client IP, or 204 if unavailable.
 
     Synchronous endpoint: geoip2 Reader.city() does mmap I/O which would