diff --git a/htdocs/comm/remx.php b/htdocs/comm/remx.php
index aa9307df8d2..4e8da77c5c0 100644
--- a/htdocs/comm/remx.php
+++ b/htdocs/comm/remx.php
@@ -121,7 +121,7 @@ if ($action == 'confirm_split' && GETPOST("confirm") == 'yes')
 		$newdiscount2->datec=$discount->datec;
 		$newdiscount1->tva_tx=$discount->tva_tx;
 		$newdiscount2->tva_tx=$discount->tva_tx;
-		$newdiscount1->amount_ttc=$_POST["amount_ttc_1"];
+		$newdiscount1->amount_ttc=$amount_ttc_1;
 		$newdiscount2->amount_ttc=price2num($discount->amount_ttc-$newdiscount1->amount_ttc);
 		$newdiscount1->amount_ht=price2num($newdiscount1->amount_ttc/(1+$newdiscount1->tva_tx/100),'MT');
 		$newdiscount2->amount_ht=price2num($newdiscount2->amount_ttc/(1+$newdiscount2->tva_tx/100),'MT');