diff --git a/bootstrapvz/common/tools.py b/bootstrapvz/common/tools.py
index 0fceb93..11ea050 100644
--- a/bootstrapvz/common/tools.py
+++ b/bootstrapvz/common/tools.py
@@ -137,4 +137,4 @@ def copy_tree(from_path, to_path):
 
 def rel_path(base, path):
     import os.path
-    return os.path.join(os.path.dirname(base), path)
+    return os.path.normpath(os.path.join(os.path.dirname(base), path))