diff --git a/core/modules/field/lib/Drupal/field/FieldInfo.php b/core/modules/field/lib/Drupal/field/FieldInfo.php
index ed1c7b1..1396c09 100644
--- a/core/modules/field/lib/Drupal/field/FieldInfo.php
+++ b/core/modules/field/lib/Drupal/field/FieldInfo.php
@@ -591,11 +591,6 @@ public function prepareInstance($instance, $field_type) {
     // Make sure all expected instance settings are present.
     $instance['settings'] += $this->fieldTypeManager->getDefaultInstanceSettings($field_type);
 
-    // Set a default value for the instance.
-    if (!isset($instance['default_value'])) {
-      $instance['default_value'] = NULL;
-    }
-
     return $instance;
   }