diff --git a/open_bus_stride_api/routers/gtfs_rides.py b/open_bus_stride_api/routers/gtfs_rides.py
index e7f074e..0da73d4 100644
--- a/open_bus_stride_api/routers/gtfs_rides.py
+++ b/open_bus_stride_api/routers/gtfs_rides.py
@@ -61,7 +61,7 @@ def _post_session_query_hook(session_query):
     ),
     common.RouteParam(
         'start_time_to', datetime.datetime, common.DocParam('start time to', filter_type='datetime_to'),
-        {'type': 'datetime_to', 'field': model.GtfsRide.end_time},
+        {'type': 'datetime_to', 'field': model.GtfsRide.start_time},
     ),
 ]