diff --git a/mongoengine/document.py b/mongoengine/document.py
index 0cdfeeb6..bdae0a38 100644
--- a/mongoengine/document.py
+++ b/mongoengine/document.py
@@ -594,13 +594,13 @@ class Document(BaseDocument):
         for field in obj._data:
             if not fields or field in fields:
                 try:
-		    setattr(self, field, self._reload(field, obj[field]))
+                    setattr(self, field, self._reload(field, obj[field]))
                 except (KeyError, AttributeError):
-		    try:
-	                # If field is a special field, e.g. items is stored as _reserved_items,
-		        # an KeyError is thrown. So try to retrieve the field from _data
-		        setattr(self, field, self._reload(field, obj._data.get(field)))
-		    except KeyError:
+                    try:
+                        # If field is a special field, e.g. items is stored as _reserved_items,
+                        # an KeyError is thrown. So try to retrieve the field from _data
+                        setattr(self, field, self._reload(field, obj._data.get(field)))
+                    except KeyError:
                         # If field is removed from the database while the object
                         # is in memory, a reload would cause a KeyError
                         # i.e. obj.update(unset__field=1) followed by obj.reload()