diff --git a/Configuration/TCA/tx_events_domain_model_event.php b/Configuration/TCA/tx_events_domain_model_event.php
index 9ed17c0..61eb0b7 100644
--- a/Configuration/TCA/tx_events_domain_model_event.php
+++ b/Configuration/TCA/tx_events_domain_model_event.php
@@ -354,7 +354,6 @@ return [
             'config' => [
                 'type' => 'category',
                 'minitems' => 0,
-                'multiple' => true,
             ],
         ],
         'keywords' => [