diff --git a/core/modules/migrate/src/Plugin/MigrateSourcePluginManager.php b/core/modules/migrate/src/Plugin/MigrateSourcePluginManager.php
index 1aaf4f180e30df58cb2248e254e96a208e1dd971..2d127502305f96254053ac0808e52abeb5ba611c 100644
--- a/core/modules/migrate/src/Plugin/MigrateSourcePluginManager.php
+++ b/core/modules/migrate/src/Plugin/MigrateSourcePluginManager.php
@@ -20,13 +20,6 @@
  */
 class MigrateSourcePluginManager extends MigratePluginManager {
 
-  /**
-   * The class loader.
-   *
-   * @var object
-   */
-  protected $classLoader;
-
   /**
    * MigrateSourcePluginManager constructor.
    *