diff --git a/src/Builder.php b/src/Builder.php
index 86e99bf..0cd11c5 100644
--- a/src/Builder.php
+++ b/src/Builder.php
@@ -247,7 +247,14 @@ protected static function putFile($path, $content)
      */
     public function substituteOutputDirs($data)
     {
-        return static::substitutePaths($data, dirname(dirname(dirname($this->outputDir))), static::BASE_DIR_MARKER);
+        $dir = static::normalizePath(dirname(dirname(dirname($this->outputDir))));
+
+        return static::substitutePaths($data, $dir, static::BASE_DIR_MARKER);
+    }
+
+    public static function normalizePath($path, $ds = DIRECTORY_SEPARATOR)
+    {
+        return rtrim(strtr($path, '/\\', $ds . $ds), $ds);
     }
 
     /**