diff --git a/apps/files_sharing/lib/SharedStorage.php b/apps/files_sharing/lib/SharedStorage.php
index 221d022bb1e37..97e4a01e2848e 100644
--- a/apps/files_sharing/lib/SharedStorage.php
+++ b/apps/files_sharing/lib/SharedStorage.php
@@ -40,6 +40,7 @@
 use OC\Files\Storage\Wrapper\PermissionsMask;
 use OC\User\NoUserException;
 use OCP\Constants;
+use OCP\Files\Cache\ICache;
 use OCP\Files\Cache\ICacheEntry;
 use OCP\Files\NotFoundException;
 use OCP\Files\Storage\IDisableEncryptionStorage;
@@ -370,8 +371,8 @@ public function getItemType() {
 
 	/**
 	 * @param string $path
-	 * @param null $storage
-	 * @return Cache
+	 * @param IStorage|null $storage
+	 * @return ICache
 	 */
 	public function getCache($path = '', $storage = null) {
 		if ($this->cache) {
diff --git a/lib/public/Files/Storage/IStorage.php b/lib/public/Files/Storage/IStorage.php
index 09e2b458c2fa4..ee26dd9c66bb4 100644
--- a/lib/public/Files/Storage/IStorage.php
+++ b/lib/public/Files/Storage/IStorage.php
@@ -434,7 +434,7 @@ public function getOwner($path);
 
 	/**
 	 * @param string $path
-	 * @param IStorage $storage
+	 * @param IStorage|null $storage
 	 * @return ICache
 	 * @since 9.0.0
 	 */