diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index 7386fad..f83dbbb 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -13,7 +13,7 @@
     // Register class auto loader
     // Custom modules1
     if ( strpos($class, 'CleantalkSP') !== false ) {
-        $class      = str_replace('CleantalkSP\Common\Scanner\HeuristicAnalyser\\', DIRECTORY_SEPARATOR, $class);
+        $class      = str_replace(array('CleantalkSP\Common\Scanner\HeuristicAnalyser\\', '\\'), DIRECTORY_SEPARATOR, $class);
         $class_file = dirname(__DIR__) . $class . '.php';
         if ( file_exists($class_file) ) {
             require_once($class_file);