diff --git a/src/ifcopenshell-python/ifcopenshell/api/cost/calculate_cost_item_resource_value.py b/src/ifcopenshell-python/ifcopenshell/api/cost/calculate_cost_item_resource_value.py
index b160803d0a..91a357a66c 100644
--- a/src/ifcopenshell-python/ifcopenshell/api/cost/calculate_cost_item_resource_value.py
+++ b/src/ifcopenshell-python/ifcopenshell/api/cost/calculate_cost_item_resource_value.py
@@ -111,7 +111,7 @@ def calculate_cost_item_resource_value(file: ifcopenshell.file, cost_item: ifcop
             continue
         if unit and "day" in unit:
             quantity = quantity / 8  # Assume 8 hour working day - TODO implement resource calendar
-        quantity = round(quantity, 2)
+        quantity = round(quantity, 5)
         formula = "{}*{}".format(cost, quantity)
         cost_value = ifcopenshell.api.cost.add_cost_value(file, parent=settings["cost_item"])
         cost_value.Name = resource.Name