diff --git a/doc/conf.py b/doc/conf.py
index b7514dd4..3ffd15e6 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -13,6 +13,7 @@
 # serve to show the default.
 
 import datetime
+import sys
 
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
@@ -26,7 +27,8 @@ import datetime
 
 # Add any Sphinx extension module names here, as strings. They can be
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
-extensions = ['rst2pdf.pdfbuilder']
+if sys.platform is not 'darwin':
+    extensions = ['rst2pdf.pdfbuilder']
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']