diff --git a/cdntaxreceipts.functions.inc b/cdntaxreceipts.functions.inc
index f5dea08228a7f363f292047837d128105453f7e2..ec793a1e52c105513dd8cec26f51f273bb9bfc7c 100644
--- a/cdntaxreceipts.functions.inc
+++ b/cdntaxreceipts.functions.inc
@@ -46,7 +46,7 @@ require_once('FPDI/src/autoload.php');
  *
  * This method is common to both single and annual receipts.
  */
-function cdntaxreceipts_processTaxReceipt($receipt, &$collectedPdf = NULL, $mode, $method = NULL) {
+function cdntaxreceipts_processTaxReceipt($receipt, &$collectedPdf = NULL, $mode = NULL, $method = NULL) {
 
   // Get contact details
   list($displayname, $email) = CRM_Contact_BAO_Contact::getContactDetails($receipt['contact_id']);
@@ -178,7 +178,7 @@ function cdntaxreceipts_processTaxReceipt($receipt, &$collectedPdf = NULL, $mode
  * This function should always be called through processTaxReceipt().  It is imperative
  * that each receipt generated by the system gets logged and archived properly.
  */
-function cdntaxreceipts_generateFormattedReceipt($receipt, &$collectedPdf = NULL, $mode) {
+function cdntaxreceipts_generateFormattedReceipt($receipt, &$collectedPdf = NULL, $mode = NULL) {
 
   $pdf_img_files_path = dirname(__FILE__) . '/img/';