diff --git a/db/routines/R__063_fn_load_planning_slots_full.sql b/db/routines/R__063_fn_load_planning_slots_full.sql
index a142281..7777559 100644
--- a/db/routines/R__063_fn_load_planning_slots_full.sql
+++ b/db/routines/R__063_fn_load_planning_slots_full.sql
@@ -53,7 +53,7 @@ begin
     ) as gs
   )
   select
-    row_number() over (order by s.interval_start) - 1 as slot_ord,
+    (row_number() over (order by s.interval_start) - 1)::int as slot_ord,
     s.interval_start,
     coalesce(
       ep.effective_buy_price_czk_kwh,