diff --git a/erpnext/accounts/doctype/subscription/test_subscription.py b/erpnext/accounts/doctype/subscription/test_subscription.py
index c17fccd..7c58e98 100644
--- a/erpnext/accounts/doctype/subscription/test_subscription.py
+++ b/erpnext/accounts/doctype/subscription/test_subscription.py
@@ -321,7 +321,8 @@
 
 		self.assertEqual(
 			flt(
-				get_prorata_factor(subscription.current_invoice_end, subscription.current_invoice_start),
+				get_prorata_factor(subscription.current_invoice_end, subscription.current_invoice_start,
+					subscription.generate_invoice_at_period_start),
 				2),
 			flt(prorate_factor, 2)
 		)
@@ -561,9 +562,7 @@
 		current_inv = subscription.get_current_invoice()
 		self.assertEqual(current_inv.status, "Unpaid")
 
-		diff = flt(date_diff(nowdate(), subscription.current_invoice_start) + 1)
-		plan_days = flt(date_diff(subscription.current_invoice_end, subscription.current_invoice_start) + 1)
-		prorate_factor = flt(diff / plan_days)
+		prorate_factor = 1
 
 		self.assertEqual(flt(current_inv.grand_total, 2), flt(prorate_factor * 900, 2))