diff --git a/core/modules/aggregator/lib/Drupal/aggregator/Form/CategorizeFormBase.php b/core/modules/aggregator/lib/Drupal/aggregator/Form/AggregatorCategorizeFormBase.php
similarity index 97%
rename from core/modules/aggregator/lib/Drupal/aggregator/Form/CategorizeFormBase.php
rename to core/modules/aggregator/lib/Drupal/aggregator/Form/AggregatorCategorizeFormBase.php
index 3bae0ff..74f4347 100644
--- a/core/modules/aggregator/lib/Drupal/aggregator/Form/CategorizeFormBase.php
+++ b/core/modules/aggregator/lib/Drupal/aggregator/Form/AggregatorCategorizeFormBase.php
@@ -2,7 +2,7 @@
 
 /**
  * @file
- * Contains \Drupal\aggregator\Form\CategorizeFormBase.
+ * Contains \Drupal\aggregator\Form\AggregatorCategorizeFormBase.
  */
 
 namespace Drupal\aggregator\Form;
@@ -19,7 +19,7 @@
 /**
  * Provides a base form to allow items to be categorized.
  */
-abstract class CategorizeFormBase extends FormBase {
+abstract class AggregatorCategorizeFormBase extends FormBase {
 
   /**
    * The aggregator item render controller.
diff --git a/core/modules/aggregator/lib/Drupal/aggregator/Form/CategorizeCategoryForm.php b/core/modules/aggregator/lib/Drupal/aggregator/Form/CategorizeCategoryForm.php
index 243acac..7d0ef1f 100644
--- a/core/modules/aggregator/lib/Drupal/aggregator/Form/CategorizeCategoryForm.php
+++ b/core/modules/aggregator/lib/Drupal/aggregator/Form/CategorizeCategoryForm.php
@@ -10,7 +10,7 @@
 /**
  * A form for categorizing feed items in a feed category.
  */
-class CategorizeCategoryForm extends CategorizeFormBase {
+class CategorizeCategoryForm extends AggregatorCategorizeFormBase {
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/aggregator/lib/Drupal/aggregator/Form/CategorizeFeedForm.php b/core/modules/aggregator/lib/Drupal/aggregator/Form/CategorizeFeedForm.php
index ce4a04f..df4d3f3 100644
--- a/core/modules/aggregator/lib/Drupal/aggregator/Form/CategorizeFeedForm.php
+++ b/core/modules/aggregator/lib/Drupal/aggregator/Form/CategorizeFeedForm.php
@@ -12,7 +12,7 @@
 /**
  * A form for categorizing feed items from a feed.
  */
-class CategorizeFeedForm extends CategorizeFormBase {
+class CategorizeFeedForm extends AggregatorCategorizeFormBase {
 
   /**
    * {@inheritdoc}