diff -u b/core/modules/user/src/MigratePassword.php b/core/modules/user/src/MigratePassword.php
--- b/core/modules/user/src/MigratePassword.php
+++ b/core/modules/user/src/MigratePassword.php
@@ -83,2 +83,9 @@
 
+  /**
+   * {@inheritdoc}
+   */
+  public function getCountLog2($setting) {
+    return $this->originalPassword->getCountLog2($setting);
+  }
+
 }