Is there any way to implement 'Undo' for ScriptableObject assets?

I have trouble implementing 'undo' for a few of my config assets (ScriptableObject's).

 [CustomEditor(MyConfig)]
 class MyConfigEditor (Editor):

 config as MyConfig

 def Awake():
     config = target as MyConfig

 def OnInspectorGUI():
     if GUILayout.Button("Change config"):
         Undo.RegisterUndo(config, "Changed config")
         ... changing the config
         EditorUtility.SetDirty(config)

It seems like undo operations are reflected in the file system, but not in the inspector.