diff --git a/docs/conf.py b/docs/conf.py
index 6681ea59..1fbfa680 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -88,7 +88,7 @@ latex_documents = [
 # this link must be referenced as :current_tarball:`z`
 extlinks = {
     'current_tarball': (
-'https://pypi.python.org/packages/source/t/tornado/tornado-%s.tar.g%%s' % version,
+        'https://pypi.python.org/packages/source/t/tornado/tornado-%s.tar.g%%s' % version,
         'tornado-%s.tar.g' % version),
     }