diff --git a/core/modules/field/tests/src/Kernel/Migrate/d7/MigrateFieldInstanceTest.php b/core/modules/field/tests/src/Kernel/Migrate/d7/MigrateFieldInstanceTest.php
index a0fdc19..55934f6 100644
--- a/core/modules/field/tests/src/Kernel/Migrate/d7/MigrateFieldInstanceTest.php
+++ b/core/modules/field/tests/src/Kernel/Migrate/d7/MigrateFieldInstanceTest.php
@@ -131,12 +131,9 @@ public function testFieldInstances() {
     $this->assertEntity('node.test_content_type.field_text', 'Text', 'text', FALSE);
     $this->assertEntity('comment.comment_node_test_content_type.field_integer', 'Integer', 'integer', FALSE);
     $this->assertEntity('user.user.field_file', 'File', 'file', FALSE);
-  }
 
-  public function testLinkFieldInstances() {
-    /** @var \Drupal\field\FieldConfigInterface $field */
     $field = FieldConfig::load('node.test_content_type.field_link');
-    $this->assertEquals(1, $field->getSetting('title'));
+    $this->assertSame(DRUPAL_OPTIONAL, $field->getSetting('title'));
   }
 
 }
diff --git a/core/modules/link/src/Plugin/migrate/cckfield/d7/LinkField.php b/core/modules/link/src/Plugin/migrate/cckfield/d7/LinkField.php
index 99a2e6c..0b689e7 100644
--- a/core/modules/link/src/Plugin/migrate/cckfield/d7/LinkField.php
+++ b/core/modules/link/src/Plugin/migrate/cckfield/d7/LinkField.php
@@ -37,9 +37,9 @@ public function processFieldInstance(MigrationInterface $migration) {
       'source' => 'instance_settings/title',
       'bypass' => TRUE,
       'map' => [
-        'disabled' => 0,
-        'optional' => 1,
-        'required' => 2,
+        'disabled' => DRUPAL_DISABLED,
+        'optional' => DRUPAL_OPTIONAL,
+        'required' => DRUPAL_REQUIRED,
       ],
     ];
     $migration->mergeProcessOfProperty('settings/title', $process);