diff --git a/ablog/post.py b/ablog/post.py
index e098b99..58e8b25 100644
--- a/ablog/post.py
+++ b/ablog/post.py
@@ -208,8 +208,9 @@ def skip_pickling(env):
 
 
     env._topickle = env.topickle
-    def topickle(self=env, *args):
-
+    import types
+    from six import class_types
+    def topickle(filename, self=env, *args):
         warnfunc = self._warnfunc
         self.set_warnfunc(None)
         values = self.config.values
diff --git a/docs/index.rst b/docs/index.rst
index 7b1e288..435ff9c 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -18,7 +18,6 @@ website project into a full-fledged blog with:
 .. _Font-Awesome integration: http://ablog.readthedocs.org/manual/ablog-configuration-options/#fa
 .. _Easy GitHub Pages deploys: http://ablog.readthedocs.org/manual/deploy-to-github-pages/
 
-
 .. _installation:
 
 Installation