diff --git a/apidoc/conf.py b/apidoc/conf.py
index 27fafcb43f4eef984403fea4bf001c4af6b76ab0..6a29f73e2be4c18b46f83a15dfbd84d9448312ae 100644
--- a/apidoc/conf.py
+++ b/apidoc/conf.py
@@ -366,3 +366,5 @@ def autodoc_skip_member(app, what, name, obj, skip, options):
 
 def setup(app):
     app.connect('autodoc-skip-member', autodoc_skip_member)
+
+graphviz_output_format = 'svg'