diff --git a/apps/files_external/lib/Service/StoragesService.php b/apps/files_external/lib/Service/StoragesService.php
index 78d36c59ba7b3..01dafbd0e8115 100644
--- a/apps/files_external/lib/Service/StoragesService.php
+++ b/apps/files_external/lib/Service/StoragesService.php
@@ -160,7 +160,7 @@ protected function readConfig() {
 	 * @return StorageConfig
 	 * @throws NotFoundException if the storage with the given id was not found
 	 */
-	public function getStorage($id) {
+	public function getStorage(int $id) {
 		$mount = $this->dbConfig->getMountById($id);
 
 		if (!is_array($mount)) {
@@ -476,7 +476,7 @@ public function updateStorage(StorageConfig $updatedStorage) {
 	 *
 	 * @throws NotFoundException if no storage was found with the given id
 	 */
-	public function removeStorage($id) {
+	public function removeStorage(int $id) {
 		$existingMount = $this->dbConfig->getMountById($id);
 
 		if (!is_array($existingMount)) {