diff --git a/DependencyInjection/Compiler/MappingPass.php b/DependencyInjection/Compiler/MappingPass.php
index 4bdd3be9..bbd4899b 100644
--- a/DependencyInjection/Compiler/MappingPass.php
+++ b/DependencyInjection/Compiler/MappingPass.php
@@ -173,7 +173,7 @@ private function getFullNamespace($filename)
 
     private function getClassname($filename)
     {
-        $directoriesAndFilename = explode('/', $filename);
+        $directoriesAndFilename = explode(DIRECTORY_SEPARATOR, $filename);
         $filename = array_pop($directoriesAndFilename);
         $nameAndExtension = explode('.', $filename);
         $className = array_shift($nameAndExtension);