diff --git a/revealjs/build.py b/revealjs/build.py
index ecff64e..61c98cb 100755
--- a/revealjs/build.py
+++ b/revealjs/build.py
@@ -5,7 +5,7 @@ import sys
 import yaml
 
 from jinja2 import Environment, FileSystemLoader
-from CommonMark import commonmark
+from commonmark import commonmark
 
 # "template macros"
 template_replace = [