diff --git a/doc/autobuild.py b/doc/autobuild.py
index a42c2eadb..3f1851211 100644
--- a/doc/autobuild.py
+++ b/doc/autobuild.py
@@ -50,7 +50,7 @@ import kivy.interactive
 from kivy.factory import Factory
 
 # force loading of all classes from factory
-for x in Factory.classes:
+for x in Factory.classes.keys()[:]:
     getattr(Factory, x)