diff --git a/lib/dir.js b/lib/dir.js
index 5a47ffa..77880d7 100644
--- a/lib/dir.js
+++ b/lib/dir.js
@@ -114,7 +114,7 @@ function constructIncludedDirectory(data) {
       return;
     }
 
-    splitDirPath = filepath.split('/');
+    splitDirPath = filepath.split(p.sep);
     splitDirPath.pop();
 
     // we generally don't want the top dir.