diff --git a/Filesystem.php b/Filesystem.php
index 7f04f6dee..c7f3dd295 100644
--- a/Filesystem.php
+++ b/Filesystem.php
@@ -673,7 +673,7 @@ public function dumpFile(string $filename, $content)
      *
      * @throws IOException If the file is not writable
      */
-    public function appendToFile(string $filename, $content/*, bool $lock = false*/)
+    public function appendToFile(string $filename, $content/* , bool $lock = false */)
     {
         if (\is_array($content)) {
             throw new \TypeError(sprintf('Argument 2 passed to "%s()" must be string or resource, array given.', __METHOD__));
diff --git a/Tests/FilesystemTest.php b/Tests/FilesystemTest.php
index 0042678e6..00a757d63 100644
--- a/Tests/FilesystemTest.php
+++ b/Tests/FilesystemTest.php
@@ -376,7 +376,7 @@ public function testRemoveCleansInvalidLinks()
 
         // create symlink to nonexistent dir
         rmdir($basePath.'dir');
-        $this->assertFalse(is_dir($basePath.'dir-link'));
+        $this->assertDirectoryDoesNotExist($basePath.'dir-link');
 
         $this->filesystem->remove($basePath);