diff --git a/src/Commands/PathautoCommands.php b/src/Commands/PathautoCommands.php
index f1ac893..17b3a90 100644
--- a/src/Commands/PathautoCommands.php
+++ b/src/Commands/PathautoCommands.php
@@ -159,7 +159,7 @@ class PathautoCommands extends DrushCommands {
       foreach ($types as $type) {
         /** @var \Drupal\pathauto\AliasTypeInterface $alias_type */
         $alias_type = $this->aliasTypeManager->createInstance($type);
-        $this->aliasStorageHelper->deleteBySourcePrefix((string) $alias_type->getSourcePrefix());
+        $this->aliasStorageHelper->deleteBySourcePrefix($alias_type->getSourcePrefix());
         $this->logger()->success(dt('All of your %label path aliases have been deleted.', [
           '%label' => $alias_type->getLabel(),
         ]));