diff --git a/web/themes/custom/popsu/popsu.theme b/web/themes/custom/popsu/popsu.theme
index 39653a52..9db9f81c 100644
--- a/web/themes/custom/popsu/popsu.theme
+++ b/web/themes/custom/popsu/popsu.theme
@@ -68,8 +68,8 @@ function popsu_preprocess_field(&$variables){
     if($element["#field_name"] == "field_programme"){
       foreach ($element["#items"]->getIterator() as $id => $item) {
         $nid = $item->getValue()['target_id'];
-        $variables['items'][$id]['attributes']['class'] = new Attribute();
-        $variables['items'][$id]['attributes']['class']->addClass("programme-".$nid);
+        $variables['items'][$nid]['attributes']['class'] = new Attribute();
+        $variables['items'][$nid]['attributes']->addClass("programme-".$nid);
       }
     }
   }