diff --git a/erpnext/accounts/doctype/sales_invoice/sales_invoice.py b/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
index 44c373f87ad..62d8ffd8974 100644
--- a/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
+++ b/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
@@ -529,8 +529,8 @@ class SalesInvoice(SellingController):
 
 	def validate_pos(self):
 		if self.is_return:
-			if flt(self.paid_amount) + flt(self.write_off_amount) - flt(self.grand_total) < \
-				1/(10**(self.precision("grand_total") + 1)):
+			if flt(self.paid_amount) + flt(self.write_off_amount) - flt(self.grand_total) > \
+				1.0/(10.0**(self.precision("grand_total") + 1.0)):
 					frappe.throw(_("Paid amount + Write Off Amount can not be greater than Grand Total"))
 
 	def validate_item_code(self):