diff --git a/application/helpers/update/updates/Update_618.php b/application/helpers/update/updates/Update_618.php
new file mode 100644
index 00000000000..d9e1872abba
--- /dev/null
+++ b/application/helpers/update/updates/Update_618.php
@@ -0,0 +1,16 @@
+<?php
+
+namespace LimeSurvey\Helpers\Update;
+
+use LimeSurvey\Helpers\Update\DatabaseUpdateBase;
+
+class Update_618 extends DatabaseUpdateBase
+{
+    /**
+     * @inheritDoc
+     */
+    public function up()
+    {
+        $this->db->createCommand()->dropIndex('{{answers_idx}}', '{{answers}}');
+    }
+}
\ No newline at end of file