diff --git a/src/Bundle/ChillActivityBundle/Export/Filter/PersonFilters/ActivityReasonFilter.php b/src/Bundle/ChillActivityBundle/Export/Filter/PersonFilters/ActivityReasonFilter.php
index 22a9ab30a..c55d579e4 100644
--- a/src/Bundle/ChillActivityBundle/Export/Filter/PersonFilters/ActivityReasonFilter.php
+++ b/src/Bundle/ChillActivityBundle/Export/Filter/PersonFilters/ActivityReasonFilter.php
@@ -77,6 +77,7 @@ class ActivityReasonFilter implements ExportElementValidatedInterface, FilterInt
             'class' => ActivityReason::class,
             'choice_label' => fn (ActivityReason $reason) => $this->translatableStringHelper->localize($reason->getName()),
             'group_by' => fn (ActivityReason $reason) => $this->translatableStringHelper->localize($reason->getCategory()->getName()),
+            'attr' => ['class' => 'select2 '],
             'multiple' => true,
             'expanded' => false,
         ]);