diff --git a/tests/System/File/Ftp/DirectoryTest.php b/tests/System/File/Ftp/DirectoryTest.php
index a6d3e6953..53ba5284a 100644
--- a/tests/System/File/Ftp/DirectoryTest.php
+++ b/tests/System/File/Ftp/DirectoryTest.php
@@ -597,6 +597,8 @@ class DirectoryTest extends \PHPUnit\Framework\TestCase
 
         self::assertTrue(\is_dir(__DIR__ . '/nodedir'));
         self::assertTrue($dir->getNode('nodedir')->deleteNode());
+
+        \clearstatcache();
         self::assertFalse(\is_dir(__DIR__ . '/nodedir'));
     }
 
@@ -731,6 +733,8 @@ class DirectoryTest extends \PHPUnit\Framework\TestCase
 
         self::assertTrue(\is_dir(__DIR__ . '/nodedir'));
         unset($dir['nodedir']);
+
+        \clearstatcache();
         self::assertFalse(\is_dir(__DIR__ . '/nodedir'));
     }
 
diff --git a/tests/System/File/Ftp/FileTest.php b/tests/System/File/Ftp/FileTest.php
index 58849c827..de632c781 100644
--- a/tests/System/File/Ftp/FileTest.php
+++ b/tests/System/File/Ftp/FileTest.php
@@ -924,6 +924,8 @@ class FileTest extends \PHPUnit\Framework\TestCase
         $file->createNode();
         self::assertTrue(\is_file($testFile));
         self::assertTrue($file->deleteNode());
+
+        \clearstatcache();
         self::assertFalse(\is_file($testFile));
     }