diff --git a/process_report/invoices/billable_invoice.py b/process_report/invoices/billable_invoice.py
index e0d97d3..7cf319b 100644
--- a/process_report/invoices/billable_invoice.py
+++ b/process_report/invoices/billable_invoice.py
@@ -110,7 +110,7 @@ def _prepare_export(self):
 
     def export(self):
         super().export()
-        self.old_pi_df.to_csv(self.old_pi_filepath, index=False)
+        self.updated_old_pi_df.to_csv(self.old_pi_filepath, index=False)
 
     def export_s3(self, s3_bucket):
         super().export_s3(s3_bucket)