diff --git a/erpnext/manufacturing/doctype/bom/bom.py b/erpnext/manufacturing/doctype/bom/bom.py
index f82afb766c6..eb01b8c81e0 100644
--- a/erpnext/manufacturing/doctype/bom/bom.py
+++ b/erpnext/manufacturing/doctype/bom/bom.py
@@ -173,7 +173,7 @@ class BOM(WebsiteGenerator):
 			#Customer Provided parts will have zero rate
 			if not frappe.db.get_value('Item', arg["item_code"], 'is_customer_provided_item'):
 				if arg.get('bom_no') and self.set_rate_of_sub_assembly_item_based_on_bom:
-					rate = self.get_bom_unitcost(arg['bom_no']) * (arg.get("conversion_factor") or 1)
+					rate = flt(self.get_bom_unitcost(arg['bom_no'])) * (arg.get("conversion_factor") or 1)
 				else:
 					if self.rm_cost_as_per == 'Valuation Rate':
 						rate = self.get_valuation_rate(arg) * (arg.get("conversion_factor") or 1)