diff --git a/tests/modules/core/lib/Storage/SQLPermanentStorageTest.php b/tests/modules/core/lib/Storage/SQLPermanentStorageTest.php
index 7e04f21ee2aa628d4fd49f829e4f8fcc47586749..13dc5d1aab9f153ba07114e0ca37b2166b11ef30 100644
--- a/tests/modules/core/lib/Storage/SQLPermanentStorageTest.php
+++ b/tests/modules/core/lib/Storage/SQLPermanentStorageTest.php
@@ -35,7 +35,7 @@ class SQLPermanentStorageTest extends TestCase
      */
     public static function tearDownAfterClass(): void
     {
-        unlink(sys_get_temp_dir() . '/sqllite/test.sqlite');
+        unlink(sys_get_temp_dir() . DIRECTORY_SEPARATOR . 'sqllite' . DIRECTORY_SEPARATOR . 'test.sqlite');
     }