diff --git a/erpnext/accounts/doctype/subscription/subscription.py b/erpnext/accounts/doctype/subscription/subscription.py
index 175710c..7c4ff73 100644
--- a/erpnext/accounts/doctype/subscription/subscription.py
+++ b/erpnext/accounts/doctype/subscription/subscription.py
@@ -276,7 +276,7 @@
 				frappe.throw(_('Subscription End Date is mandatory to follow calendar months'))
 
 			if billing_info[0]['billing_interval'] != 'Month':
-				frappe.throw('Billing Interval in Subscription Plan must be Month to follow calendar months')
+				frappe.throw(_('Billing Interval in Subscription Plan must be Month to follow calendar months'))
 
 	def after_insert(self):
 		# todo: deal with users who collect prepayments. Maybe a new Subscription Invoice doctype?