diff --git a/docs/conf.py b/docs/conf.py
index f860e47e..d5fa0e2c 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -44,7 +44,7 @@ extensions = [
     'sphinx.ext.imgmath',
     'sphinx.ext.viewcode',
     'sphinx.ext.githubpages',
-    'sphinx_rtd_theme'
+    'sphinx-rtd-theme'
 ]
 
 # Add any paths that contain templates here, relative to this directory.