diff --git a/nova/flags.py b/nova/flags.py
index 32cb6efa..7304700f 100644
--- a/nova/flags.py
+++ b/nova/flags.py
@@ -110,7 +110,7 @@ class FlagValues(gflags.FlagValues):
         return name in self.__dict__['__dirty']
 
     def ClearDirty(self):
-        self.__dict__['__is_dirty'] = []
+        self.__dict__['__dirty'] = []
 
     def WasAlreadyParsed(self):
         return self.__dict__['__was_already_parsed']
@@ -119,11 +119,11 @@ class FlagValues(gflags.FlagValues):
         if '__stored_argv' not in self.__dict__:
             return
         new_flags = FlagValues(self)
-        for k in self.__dict__['__dirty']:
+        for k in self.FlagDict().iterkeys():
             new_flags[k] = gflags.FlagValues.__getitem__(self, k)
 
         new_flags(self.__dict__['__stored_argv'])
-        for k in self.__dict__['__dirty']:
+        for k in new_flags.FlagDict().iterkeys():
             setattr(self, k, getattr(new_flags, k))
         self.ClearDirty()