diff --git a/lib/private/Files/Filesystem.php b/lib/private/Files/Filesystem.php
index 404ea4ed804acfcc7649531b48c2d92aea9f82fb..6090012871744c5cff77d43d83126615347a1059 100644
--- a/lib/private/Files/Filesystem.php
+++ b/lib/private/Files/Filesystem.php
@@ -627,7 +627,7 @@ class Filesystem {
 	 * check if the directory should be ignored when scanning
 	 * NOTE: the special directories . and .. would cause never ending recursion
 	 *
-	 * @param String $dir
+	 * @param string $dir
 	 * @return boolean
 	 */
 	static public function isIgnoredDir($dir) {
diff --git a/lib/private/Files/Node/Root.php b/lib/private/Files/Node/Root.php
index b8214576d7dee50d775d1557568e749588eb78ec..189c2863a34aa29f89597209a25e8e36db72e8fc 100644
--- a/lib/private/Files/Node/Root.php
+++ b/lib/private/Files/Node/Root.php
@@ -348,7 +348,7 @@ class Root extends Folder implements IRootFolder {
 	/**
 	 * Returns a view to user's files folder
 	 *
-	 * @param String $userId user ID
+	 * @param string $userId user ID
 	 * @return \OCP\Files\Folder
 	 * @throws \OC\User\NoUserException
 	 */
diff --git a/lib/private/legacy/util.php b/lib/private/legacy/util.php
index f3c6cb7e363c47d3386864778103be0f5b5d2020..07482a693f589f807480b778199ba6a39838596e 100644
--- a/lib/private/legacy/util.php
+++ b/lib/private/legacy/util.php
@@ -390,7 +390,7 @@ class OC_Util {
 	/**
 	 * copies the skeleton to the users /files
 	 *
-	 * @param String $userId
+	 * @param string $userId
 	 * @param \OCP\Files\Folder $userDirectory
 	 * @throws \OCP\Files\NotFoundException
 	 * @throws \OCP\Files\NotPermittedException
diff --git a/lib/public/Files/IRootFolder.php b/lib/public/Files/IRootFolder.php
index 38e45f4967865ac4c2bc8d16899814d080339572..b041bcae301ea08e8ef0a3caebc4678168d6e192 100644
--- a/lib/public/Files/IRootFolder.php
+++ b/lib/public/Files/IRootFolder.php
@@ -37,7 +37,7 @@ interface IRootFolder extends Folder, Emitter {
 	/**
 	 * Returns a view to user's files folder
 	 *
-	 * @param String $userId user ID
+	 * @param string $userId user ID
 	 * @return \OCP\Files\Folder
 	 * @since 8.2.0
 	 */