diff --git a/erpnext/selling/doctype/customer/customer.py b/erpnext/selling/doctype/customer/customer.py
index 9b5cd7c6557..4c2f6999e4c 100644
--- a/erpnext/selling/doctype/customer/customer.py
+++ b/erpnext/selling/doctype/customer/customer.py
@@ -405,7 +405,7 @@ class Customer(TransactionBase):
 
 		delete_contact_and_address("Customer", self.name)
 		if self.lead_name:
-			frappe.db.sql("update `tabLead` set status='Interested' where name=%s", self.lead_name)
+			frappe.db.set_value("Lead", self.lead_name, "status", "Interested")
 
 	def before_rename(self, olddn, newdn, merge=False):
 		if merge: