diff --git a/search_api_db/src/Plugin/search_api/backend/Database.php b/search_api_db/src/Plugin/search_api/backend/Database.php
index 93c61f9..aa9d707 100644
--- a/search_api_db/src/Plugin/search_api/backend/Database.php
+++ b/search_api_db/src/Plugin/search_api/backend/Database.php
@@ -1027,7 +1027,7 @@ class Database extends BackendPluginBase {
     $denormalized_table = $db_info['index_table'];
     $item_id = $item->getId();
 
-    $txn = $this->database->startTransaction('search_api_db_indexing');
+    $transaction = $this->database->startTransaction('search_api_db_indexing');
 
     try {
       // Remove the item from the denormalized table.
@@ -1169,7 +1169,7 @@ class Database extends BackendPluginBase {
       }
     }
     catch (\Exception $e) {
-      $txn->rollback();
+      $transaction->rollback();
       throw $e;
     }
   }