diff --git a/doc/conf.py b/doc/conf.py
index 7fdba137532ad5938e85cafbdc9af0f1a2952bf2..25ca5624cbcb7480a83f15b3913e001f6bcf33c2 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -49,6 +49,8 @@ html_use_smartypants = True
 # Output file base name for HTML help builder.
 htmlhelp_basename = 'apidoc'
 
+# Theme
+html_theme = 'sphinx_rtd_theme'
 
 # -- Options for LaTeX output --------------------------------------------------