diff --git a/graphene/core/classtypes/objecttype.py b/graphene/core/classtypes/objecttype.py
index 2bcb5e68..91b18815 100644
--- a/graphene/core/classtypes/objecttype.py
+++ b/graphene/core/classtypes/objecttype.py
@@ -54,7 +54,12 @@ class ObjectType(six.with_metaclass(ObjectTypeMeta, FieldsClassType)):
 
     def __init__(self, *args, **kwargs):
         signals.pre_init.send(self.__class__, args=args, kwargs=kwargs)
+        
         self._root = kwargs.pop('_root', None)
+        for key, value in kwargs.items():
+            if key.startswith('_'):
+                setattr(self, key, kwargs.pop(key))
+                
         args_len = len(args)
         fields = self._meta.fields
         if args_len > len(fields):