diff --git a/src/ifcopenshell-python/ifcopenshell/api/cost/assign_cost_item_quantity.py b/src/ifcopenshell-python/ifcopenshell/api/cost/assign_cost_item_quantity.py
index c699bb1ebb..7ddfaa2dd0 100644
--- a/src/ifcopenshell-python/ifcopenshell/api/cost/assign_cost_item_quantity.py
+++ b/src/ifcopenshell-python/ifcopenshell/api/cost/assign_cost_item_quantity.py
@@ -137,7 +137,7 @@ class Usecase:
         if self.prop_name or formula:
             self.quantities = set(cost_item.CostQuantities or [])
         for product in products:
-            if product.is_a("IfcSpatialElement"):
+            if product.is_a("IfcSpatialElement") and not product.is_a("IfcSpace"):
                 continue
             ifcopenshell.api.control.assign_control(
                 self.file,