diff --git a/incorporealcms/mdx/pydot.py b/incorporealcms/mdx/pydot.py
index e644a58..3228b25 100644
--- a/incorporealcms/mdx/pydot.py
+++ b/incorporealcms/mdx/pydot.py
@@ -12,10 +12,9 @@ logger = logging.getLogger(__name__)
 class InlinePydot(markdown.Extension):
     """Wrap the markdown prepcoressor."""
 
-    def extendMarkdown(self, md, md_globals):
+    def extendMarkdown(self, md):
         """Add InlinePydotPreprocessor to the Markdown instance."""
-        md.registerExtension(self)
-        md.preprocessors.add('dot_block', InlinePydotPreprocessor(md), '_begin')
+        md.preprocessors.register(InlinePydotPreprocessor(md), 'dot_block', 100)
 
 
 class InlinePydotPreprocessor(markdown.preprocessors.Preprocessor):