diff --git a/doc/source/conf.py b/doc/source/conf.py
index 8351bea0..bcca5c2b 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -25,6 +25,7 @@
 
 extensions = [
         'sphinx.ext.duration',
+        'sphinx.ext.imgconverter',
 ]
 
 templates_path = ['_templates']