diff --git a/core/modules/migrate/src/MigrateExecutable.php b/core/modules/migrate/src/MigrateExecutable.php
index eacf9ae..14bbe9e 100644
--- a/core/modules/migrate/src/MigrateExecutable.php
+++ b/core/modules/migrate/src/MigrateExecutable.php
@@ -67,13 +67,6 @@ class MigrateExecutable implements MigrateExecutableInterface {
   protected $counts = array();
 
   /**
-   * The object currently being constructed.
-   *
-   * @var \stdClass
-   */
-  protected $destinationValues;
-
-  /**
    * The source.
    *
    * @var \Drupal\migrate\Plugin\MigrateSourceInterface
@@ -81,13 +74,6 @@ class MigrateExecutable implements MigrateExecutableInterface {
   protected $source;
 
   /**
-   * The current data row retrieved from the source.
-   *
-   * @var \stdClass
-   */
-  protected $sourceValues;
-
-  /**
    * The event dispatcher.
    *
    * @var \Symfony\Component\EventDispatcher\EventDispatcherInterface
@@ -268,8 +254,6 @@ public function import() {
         }
       }
 
-      // Reset row properties.
-      unset($sourceValues, $destinationValues);
       $this->sourceRowStatus = MigrateIdMapInterface::STATUS_IMPORTED;
 
       // Check for memory exhaustion.