diff --git a/lib/private/Files/ObjectStore/AppdataPreviewObjectStoreStorage.php b/lib/private/Files/ObjectStore/AppdataPreviewObjectStoreStorage.php
index 2f6db935236af..b2be77a3d14c9 100644
--- a/lib/private/Files/ObjectStore/AppdataPreviewObjectStoreStorage.php
+++ b/lib/private/Files/ObjectStore/AppdataPreviewObjectStoreStorage.php
@@ -26,9 +26,12 @@
 namespace OC\Files\ObjectStore;
 
 class AppdataPreviewObjectStoreStorage extends ObjectStoreStorage {
-	/** @var string */
-	private $internalId;
+	private string $internalId;
 
+	/**
+	 * @param array{internal-id: int|string} $params
+	 * @throws \Exception
+	 */
 	public function __construct($params) {
 		if (!isset($params['internal-id'])) {
 			throw new \Exception('missing id in parameters');
@@ -37,7 +40,7 @@ public function __construct($params) {
 		parent::__construct($params);
 	}
 
-	public function getId() {
+	public function getId(): string {
 		return 'object::appdata::preview:' . $this->internalId;
 	}
 }
diff --git a/lib/private/Files/ObjectStore/HomeObjectStoreStorage.php b/lib/private/Files/ObjectStore/HomeObjectStoreStorage.php
index feceb706e19df..2be17d2e15170 100644
--- a/lib/private/Files/ObjectStore/HomeObjectStoreStorage.php
+++ b/lib/private/Files/ObjectStore/HomeObjectStoreStorage.php
@@ -26,6 +26,7 @@
  */
 namespace OC\Files\ObjectStore;
 
+use Exception;
 use OCP\Files\IHomeStorage;
 use OCP\IUser;
 
@@ -34,17 +35,19 @@ class HomeObjectStoreStorage extends ObjectStoreStorage implements IHomeStorage
 
 	/**
 	 * The home user storage requires a user object to create a unique storage id
-	 * @param array $params
+	 *
+	 * @param array{user: IUser} $params
+	 * @throws Exception
 	 */
 	public function __construct($params) {
 		if (! isset($params['user']) || ! $params['user'] instanceof IUser) {
-			throw new \Exception('missing user object in parameters');
+			throw new Exception('missing user object in parameters');
 		}
 		$this->user = $params['user'];
 		parent::__construct($params);
 	}
 
-	public function getId() {
+	public function getId(): string {
 		return 'object::user:' . $this->user->getUID();
 	}
 
@@ -54,7 +57,7 @@ public function getId() {
 	 * @param string $path The path to get the owner
 	 * @return false|string uid
 	 */
-	public function getOwner($path) {
+	public function getOwner($path): bool|string {
 		if (is_object($this->user)) {
 			return $this->user->getUID();
 		}
diff --git a/lib/private/Files/ObjectStore/ObjectStoreStorage.php b/lib/private/Files/ObjectStore/ObjectStoreStorage.php
index 03af4a86bdb24..d9bc973082a19 100644
--- a/lib/private/Files/ObjectStore/ObjectStoreStorage.php
+++ b/lib/private/Files/ObjectStore/ObjectStoreStorage.php
@@ -47,6 +47,7 @@
 use OCP\Files\ObjectStore\IObjectStoreMultiPartUpload;
 use OCP\Files\Storage\IChunkedFileWrite;
 use OCP\Files\Storage\IStorage;
+use OCP\ILogger;
 
 class ObjectStoreStorage extends \OC\Files\Storage\Common implements IChunkedFileWrite {
 	use CopyDirectory;
@@ -55,11 +56,14 @@ class ObjectStoreStorage extends \OC\Files\Storage\Common implements IChunkedFil
 	protected string $id;
 	private string $objectPrefix = 'urn:oid:';
 
-	private $logger;
+	private ILogger $logger;
 
-	/** @var bool */
-	protected $validateWrites = true;
+	protected bool $validateWrites = true;
 
+	/**
+	 * @param array{objectstore: IObjectStore, storageid?: string, objectPrefix?: string, validateWrites?: bool} $params
+	 * @throws \Exception
+	 */
 	public function __construct($params) {
 		if (isset($params['objectstore']) && $params['objectstore'] instanceof IObjectStore) {
 			$this->objectStore = $params['objectstore'];
diff --git a/tests/lib/Files/ObjectStore/ObjectStoreStorageOverwrite.php b/tests/lib/Files/ObjectStore/ObjectStoreStorageOverwrite.php
index b85f6289c9485..9c3981315359b 100644
--- a/tests/lib/Files/ObjectStore/ObjectStoreStorageOverwrite.php
+++ b/tests/lib/Files/ObjectStore/ObjectStoreStorageOverwrite.php
@@ -30,7 +30,7 @@
  * Allow overwriting the object store instance for test purposes
  */
 class ObjectStoreStorageOverwrite extends ObjectStoreStorage {
-	public function setObjectStore(IObjectStore $objectStore) {
+	public function setObjectStore(IObjectStore $objectStore): void {
 		$this->objectStore = $objectStore;
 	}
 
@@ -38,7 +38,7 @@ public function getObjectStore(): IObjectStore {
 		return $this->objectStore;
 	}
 
-	public function setValidateWrites(bool $validate) {
+	public function setValidateWrites(bool $validate): void {
 		$this->validateWrites = $validate;
 	}
 }