diff --git a/htdocs/product/card.php b/htdocs/product/card.php
index de08820d2bf..163c55b5da5 100644
--- a/htdocs/product/card.php
+++ b/htdocs/product/card.php
@@ -2220,7 +2220,7 @@ if (($action == 'clone' && (empty($conf->use_javascript_ajax) || !empty($conf->d
 		$formquestionclone[] = array('type' => 'checkbox', 'name' => 'clone_composition', 'label' => $langs->trans('CloneCompositionProduct'), 'value' => 1);
 	}
 
-	$formconfirm = $form->formconfirm($_SERVER["PHP_SELF"].'?id='.$object->id, $langs->trans('ToClone'), $langs->trans('ConfirmCloneProduct', $object->ref), 'confirm_clone', $formquestionclone, 'yes', 'action-clone', 350, 600);
+	$formconfirm .= $form->formconfirm($_SERVER["PHP_SELF"].'?id='.$object->id, $langs->trans('ToClone'), $langs->trans('ConfirmCloneProduct', $object->ref), 'confirm_clone', $formquestionclone, 'yes', 'action-clone', 350, 600);
 }
 
 // Call Hook formConfirm