diff --git a/doc/conf.py b/doc/conf.py
index 732c4d4a0..724d355d0 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -72,6 +72,7 @@ latex_elements = {
 ''',
 }
 latex_show_urls = 'footnote'
+latex_use_xindy = True
 
 autodoc_member_order = 'groupwise'
 todo_include_todos = True