diff --git a/backend/app/services/site_finder/connection_capacity_lookup.py b/backend/app/services/site_finder/connection_capacity_lookup.py
index 60e98369..155f5494 100644
--- a/backend/app/services/site_finder/connection_capacity_lookup.py
+++ b/backend/app/services/site_finder/connection_capacity_lookup.py
@@ -523,10 +523,9 @@ def _query_nearby_network_zones(db: Session, parcel_wkt: str) -> list[dict]:
     """
     try:
         with db.begin_nested():
-            db.execute(
-                text("SET LOCAL statement_timeout = :ms"),
-                {"ms": str(_NETWORK_ZONE_TIMEOUT_MS)},
-            )
+            # SET не принимает bind-параметры (extended protocol → syntax error
+            # at or near "$1") — только литерал, как у offer_trend (parcels.py).
+            db.execute(text(f"SET LOCAL statement_timeout = '{_NETWORK_ZONE_TIMEOUT_MS:d}'"))
             rows = (
                 db.execute(
                     text("""