diff --git a/core/modules/migrate/src/MigrateExecutable.php b/core/modules/migrate/src/MigrateExecutable.php
index 9c27514228f404dd720d35201a5e847fed2616ea..0488d966562233fc424f97ef381671561c1e7b5f 100644
--- a/core/modules/migrate/src/MigrateExecutable.php
+++ b/core/modules/migrate/src/MigrateExecutable.php
@@ -66,13 +66,6 @@ class MigrateExecutable implements MigrateExecutableInterface {
    */
   protected $counts = array();
 
-  /**
-   * The object currently being constructed.
-   *
-   * @var \stdClass
-   */
-  protected $destinationValues;
-
   /**
    * The source.
    *
@@ -80,13 +73,6 @@ class MigrateExecutable implements MigrateExecutableInterface {
    */
   protected $source;
 
-  /**
-   * The current data row retrieved from the source.
-   *
-   * @var \stdClass
-   */
-  protected $sourceValues;
-
   /**
    * The event dispatcher.
    *
@@ -277,8 +263,6 @@ public function import() {
         }
       }
 
-      // Reset row properties.
-      unset($sourceValues, $destinationValues);
       $this->sourceRowStatus = MigrateIdMapInterface::STATUS_IMPORTED;
 
       // Check for memory exhaustion.