diff --git a/oml/pdict.py b/oml/pdict.py
index 020d5a4..0ee9377 100644
--- a/oml/pdict.py
+++ b/oml/pdict.py
@@ -18,7 +18,7 @@ class pdict(dict):
     def _save(self):
         if self._path:
             with open(self._path, 'w') as fd:
-                json.dump(self, fd, indent=1)
+                json.dump(self, fd, indent=4, sort_keys=True)
 
     def get(self, key, default=None):
         if default == None and self._defaults: