diff --git a/backend/app/services/site_finder/velocity.py b/backend/app/services/site_finder/velocity.py
index d3bb9b68..0dd76d54 100644
--- a/backend/app/services/site_finder/velocity.py
+++ b/backend/app/services/site_finder/velocity.py
@@ -186,7 +186,7 @@ def compute_velocity(
                       FROM objective_corpus_room_month crm
                       JOIN mapped m
                         ON m.objective_complex_name = crm.project_name
-                     WHERE crm.report_month >= (CURRENT_DATE - :window_interval::interval)
+                     WHERE crm.report_month >= (CURRENT_DATE - CAST(:window_interval AS interval))
                        AND crm.deals_total_count > 0
                      GROUP BY m.obj_id
                     """
@@ -299,7 +299,7 @@ def _get_ekb_median(db: Session, months_window: int = 6) -> float | None:
                                          deals_total_count * 45.0)) AS total_sqm,
                             COUNT(DISTINCT report_month) AS months_data
                           FROM objective_corpus_room_month
-                         WHERE report_month >= (CURRENT_DATE - :window_interval::interval)
+                         WHERE report_month >= (CURRENT_DATE - CAST(:window_interval AS interval))
                            AND deals_total_count > 0
                          GROUP BY project_name
                         HAVING COUNT(DISTINCT report_month) >= 3