diff --git a/htdocs/compta/facture/card.php b/htdocs/compta/facture/card.php
index 10de9581dfe..44be21898f8 100644
--- a/htdocs/compta/facture/card.php
+++ b/htdocs/compta/facture/card.php
@@ -1295,7 +1295,6 @@ if (empty($reshook))
 									$TTotalByTva[$line->tva_tx] += $line->total_ttc ;
 								}
 
-								$amount_to_diff = 0;
 								foreach ($TTotalByTva as $tva => &$total)
 								{
 									$coef = $total / $srcobject->total_ttc; // Calc coef