diff --git a/doc/source/conf.py b/doc/source/conf.py
index 41de7c5..9739d8a 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -116,7 +116,7 @@ html_theme_path = ['_themes']
 # The name of an image file (within the static path) to use as favicon of the
 # docs.  This file should be a Windows icon file (.ico) being 16x16 or 32x32
 # pixels large.
-html_favicon = 'favicon.png'
+html_favicon = 'favicon.ico'
 
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,