diff --git a/htdocs/core/boxes/box_graph_invoices_permonth.php b/htdocs/core/boxes/box_graph_invoices_permonth.php
index b272f350717..9b2a5437b8a 100644
--- a/htdocs/core/boxes/box_graph_invoices_permonth.php
+++ b/htdocs/core/boxes/box_graph_invoices_permonth.php
@@ -215,9 +215,9 @@ class box_graph_invoices_permonth extends ModeleBoxes
 				$stringtoshow.='<form class="flat formboxfilter" method="POST" action="'.$_SERVER["PHP_SELF"].'">';
 				$stringtoshow.='<input type="hidden" name="action" value="'.$refreshaction.'">';
 				$stringtoshow.='<input type="hidden" name="DOL_AUTOSET_COOKIE" value="DOLUSERCOOKIE_box_'.$this->boxcode.':year,shownb,showtot">';
-				$stringtoshow.='<input type="checkbox" name="'.$param_shownb.'"'.($shownb?' checked="true"':'').'"> '.$langs->trans("NumberOfBillsByMonth");
+				$stringtoshow.='<input type="checkbox" name="'.$param_shownb.'"'.($shownb?' checked="true"':'').'> '.$langs->trans("NumberOfBillsByMonth");
 				$stringtoshow.=' &nbsp; ';
-				$stringtoshow.='<input type="checkbox" name="'.$param_showtot.'"'.($showtot?' checked="true"':'').'"> '.$langs->trans("AmountOfBillsByMonthHT");
+				$stringtoshow.='<input type="checkbox" name="'.$param_showtot.'"'.($showtot?' checked="true"':'').'> '.$langs->trans("AmountOfBillsByMonthHT");
 				$stringtoshow.='<br>';
 				$stringtoshow.=$langs->trans("Year").' <input class="flat" size="4" type="text" name="'.$param_year.'" value="'.$endyear.'">';
 				$stringtoshow.='<input type="image" alt="'.$langs->trans("Refresh").'" src="'.img_picto($langs->trans("Refresh"),'refresh.png','','',1).'">';