diff --git a/src/web_api.py b/src/web_api.py
index a2226d7..ab51337 100644
--- a/src/web_api.py
+++ b/src/web_api.py
@@ -444,7 +444,7 @@ async def get_thaiwater_sensors():
 @app.get("/measurements/history/{station_code}")
 async def get_postgres_history(
     station_code: str,
-    hours: int = Query(168, ge=1, le=24 * 365),
+    hours: int = Query(168, ge=1),
     limit: int = Query(2000, ge=1, le=5000),
 ):
     """Get historical measurements for a station from PostgreSQL."""