diff --git a/htdocs/core/lib/accounting.lib.php b/htdocs/core/lib/accounting.lib.php
index 21afb5f3490..4dbdd9f5be8 100644
--- a/htdocs/core/lib/accounting.lib.php
+++ b/htdocs/core/lib/accounting.lib.php
@@ -274,6 +274,9 @@ function getDefaultDatesForTransfer()
 {
 	global $db, $conf;
 
+	$pastmonth = 0;
+	$pastmonthyear = 0;
+
 	// Period by default on transfer (0: previous month | 1: current month | 2: fiscal year)
 	$periodbydefaultontransfer = (empty($conf->global->ACCOUNTING_DEFAULT_PERIOD_ON_TRANSFER) ? 0 : $conf->global->ACCOUNTING_DEFAULT_PERIOD_ON_TRANSFER);
 	if ($periodbydefaultontransfer == 2) {