diff --git a/core/modules/field/field.api.php b/core/modules/field/field.api.php
index d2c182c4c1b..ecd65f47cb7 100644
--- a/core/modules/field/field.api.php
+++ b/core/modules/field/field.api.php
@@ -224,7 +224,7 @@ function hook_field_widget_WIDGET_TYPE_form_alter(&$element, \Drupal\Core\Form\F
  */
 function hook_field_formatter_info_alter(array &$info) {
   // Let a new field type re-use an existing formatter.
-  $info['text_default']['field types'][] = 'my_field_type';
+  $info['text_default']['field_types'][] = 'my_field_type';
 }
 
 /**