diff --git a/__init__.py b/__init__.py
index 433478f..6ada564 100644
--- a/__init__.py
+++ b/__init__.py
@@ -16,7 +16,7 @@ import os
 import bpy
 from . import environment
 from . import utils
-
+from bpy.app.handlers import persistent
 
 DEPENDENCIES = {
     "zmq",