diff --git a/lib/Migration/Version19000Date20241029123147.php b/lib/Migration/Version19000Date20241029123147.php
new file mode 100644
index 000000000..00348cea0
--- /dev/null
+++ b/lib/Migration/Version19000Date20241029123147.php
@@ -0,0 +1,35 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\GroupFolders\Migration;
+
+use Closure;
+use OCP\DB\ISchemaWrapper;
+use OCP\Migration\IOutput;
+use OCP\Migration\SimpleMigrationStep;
+
+class Version19000Date20241029123147 extends SimpleMigrationStep {
+	/**
+	 * @param Closure(): ISchemaWrapper $schemaClosure
+	 */
+	public function changeSchema(IOutput $output, Closure $schemaClosure, array $options): ?ISchemaWrapper {
+		/** @var ISchemaWrapper $schema */
+		$schema = $schemaClosure();
+
+		if ($schema->hasTable('group_folders')) {
+			$table = $schema->getTable('group_folders');
+			if (!$table->hasIndex('gf_folders_folder_id')) {
+				$table->addUniqueIndex(['folder_id'], 'gf_folders_folder_id');
+				return $schema;
+			}
+		}
+
+		return null;
+	}
+}