diff --git a/database/migrations/2022_03_14_120000_alter_task_results_table_add_index_on_created_at.php b/database/migrations/2022_03_14_120000_alter_task_results_table_add_index_on_created_at.php
index b7b96278..6c3817b6 100644
--- a/database/migrations/2022_03_14_120000_alter_task_results_table_add_index_on_created_at.php
+++ b/database/migrations/2022_03_14_120000_alter_task_results_table_add_index_on_created_at.php
@@ -28,7 +28,7 @@ public function down()
     {
         Schema::connection(TOTEM_DATABASE_CONNECTION)
             ->table(TOTEM_TABLE_PREFIX.'task_results', function (Blueprint $table) {
-                $table->dropIndex('created_at');
+                $table->dropIndex(TOTEM_TABLE_PREFIX.'task_results_created_at_index');
             });
     }
 }