diff --git a/htdocs/product/price.php b/htdocs/product/price.php
index 15a9d205a9e..69802f51d57 100644
--- a/htdocs/product/price.php
+++ b/htdocs/product/price.php
@@ -920,7 +920,7 @@ if ($action == 'edit_price' && ($user->rights->produit->creer || $user->rights->
 			print '<form action="' . $_SERVER["PHP_SELF"] . '?id=' . $object->id . '" method="POST">';
 		    if ($i > 1) print '<br>';
 			elseif (! empty($conf->global->PRODUIT_MULTIPRICES) && ! empty($conf->global->PRODUIT_MULTIPRICES_ALLOW_AUTOCALC_PRICELEVEL)) {
-				print $langs->trans('UseMultipriceRules'). ' <input type="checkbox" id="usePriceRules" name="usePriceRules" value="on" '.($object->price_autogen ? 'checked' : '').'><br><br>';
+				print $langs->trans('UseMultipriceRules'). ' <input type="checkbox" id="usePriceRules" name="usePriceRules" '.($object->price_autogen ? 'checked' : '').'><br><br>';
 			}
 			print '<input type="hidden" name="token" value="' . $_SESSION['newtoken'] . '">';
 			print '<input type="hidden" name="action" value="update_price">';