diff --git a/core/modules/migrate/src/Plugin/Migration.php b/core/modules/migrate/src/Plugin/Migration.php
index 4df82e3028..2bf6b6f0f1 100644
--- a/core/modules/migrate/src/Plugin/Migration.php
+++ b/core/modules/migrate/src/Plugin/Migration.php
@@ -510,7 +510,6 @@ public function setTrackLastImported($track_last_imported) {
    * {@inheritdoc}
    */
   public function getMigrationDependencies() {
-    $this->configuration['migration_dependencies'] = ($this->migration_dependencies ?: []) + ['required' => [], 'optional' => []];
     $this->configuration['migration_dependencies']['optional'] = array_unique(array_merge($this->configuration['migration_dependencies']['optional'], $this->findMigrationDependencies($this->configuration['process'])));
     return $this->configuration['migration_dependencies'];
   }