diff --git a/import2ledger/importers/nbpy2017.py b/import2ledger/importers/nbpy2017.py
index c0109cab3aec1734ed890f8a9878c2e0ecefd041..71686f499c397ac01c81d132ece3ce0c3cd05737 100644
--- a/import2ledger/importers/nbpy2017.py
+++ b/import2ledger/importers/nbpy2017.py
@@ -10,10 +10,10 @@ STATUS_PAID = 'Payment'
 STATUS_REFUNDED = 'Refund'
 
 class Invoice2017:
-    STANDARD_TICKET_RATE = decimal.Decimal('42.50')
-    DISCOUNT_TICKET_RATE = STANDARD_TICKET_RATE / 2
-    STANDARD_SHIRT_RATE = decimal.Decimal('25.50')
-    DISCOUNT_SHIRT_RATE = STANDARD_SHIRT_RATE
+    STANDARD_TICKET_RBI = decimal.Decimal('42.50')
+    DISCOUNT_TICKET_RBI = STANDARD_TICKET_RBI / 2
+    STANDARD_SHIRT_RBI = decimal.Decimal('25.50')
+    DISCOUNT_SHIRT_RBI = STANDARD_SHIRT_RBI
     CURRENCY = 'USD'
 
     @classmethod
@@ -78,9 +78,9 @@ class Invoice2017:
     def _read_invoice_items(self, table, first_row_text, rows_text):
         self.amount = decimal.Decimal(0)
         self.tickets_sold = decimal.Decimal(0)
-        self.ticket_rate = self.STANDARD_TICKET_RATE
+        self.ticket_rate = self.STANDARD_TICKET_RBI
         self.shirts_sold = decimal.Decimal(0)
-        self.shirt_rate = self.STANDARD_SHIRT_RATE
+        self.shirt_rate = self.STANDARD_SHIRT_RBI
         for description, qty, unit_price, total in rows_text:
             if qty is None:
                 continue
@@ -92,7 +92,7 @@ class Invoice2017:
             elif description.startswith('T-Shirt - '):
                 self.shirts_sold += int(qty)
             elif description.startswith('Early Bird ('):
-                self.ticket_rate = self.DISCOUNT_TICKET_RATE
+                self.ticket_rate = self.DISCOUNT_TICKET_RBI
 
     def _read_invoice_activity(self, table, first_row_text, rows_text):
         self.actions = [{