diff --git a/htdocs/variants/ajax/getCombinations.php b/htdocs/variants/ajax/getCombinations.php
index 8b7baaee27e..5c57191c3eb 100644
--- a/htdocs/variants/ajax/getCombinations.php
+++ b/htdocs/variants/ajax/getCombinations.php
@@ -28,7 +28,7 @@ require_once DOL_DOCUMENT_ROOT.'/variants/class/ProductCombination.class.php';
 
 header('Content-Type: application/json');
 
-$id = GETPOST('id');
+$id = GETPOST('id', 'int');
 
 if (!$id) {
 	print json_encode(array(