diff --git a/htdocs/boutique/livre/livre.class.php b/htdocs/boutique/livre/livre.class.php
index dddaa8b50be..5f2d412f38e 100644
--- a/htdocs/boutique/livre/livre.class.php
+++ b/htdocs/boutique/livre/livre.class.php
@@ -405,7 +405,7 @@ class Livre {
 	  }
 	else
 	  {
-	    $sql .= ", products_weight = 150000";
+	    $sql .= ", products_weight = 0.5";
 	  }
 
 	$sql .= " WHERE products_id = " . $this->oscid;