diff --git a/scripts/import_investment_historicalrates.py b/scripts/import_investment_historicalrates.py
index e3fe059..5aa4f07 100644
--- a/scripts/import_investment_historicalrates.py
+++ b/scripts/import_investment_historicalrates.py
@@ -4,7 +4,7 @@
 # The COPYRIGHT file at the top level of this repository contains the
 # full copyright notices and license terms.
 
-import csv
+import csv, os, sys
 from argparse import ArgumentParser
 from datetime import datetime, date
 from decimal import Decimal