diff --git a/core/modules/options/lib/Drupal/options/Plugin/field/field_type/ListItemBase.php b/core/modules/options/lib/Drupal/options/Plugin/field/field_type/ListItemBase.php
index 3d116a6..e5d0f5d 100644
--- a/core/modules/options/lib/Drupal/options/Plugin/field/field_type/ListItemBase.php
+++ b/core/modules/options/lib/Drupal/options/Plugin/field/field_type/ListItemBase.php
@@ -247,7 +247,6 @@ public function getConstraints() {
         'Choice' => array(
           'choices' => array_keys($allowed_values),
           'message' => t('%name: illegal value selected.', array('%name' => $instance['label'])),
-          'multiple' => $instance->getFieldCardinality() != 1,
         ),
       ),
     ));