diff --git a/scrapy/trunk/docs/_ext/scrapydocs.py b/scrapy/trunk/docs/_ext/scrapydocs.py
index 8ae3a40f9..b54952422 100644
--- a/scrapy/trunk/docs/_ext/scrapydocs.py
+++ b/scrapy/trunk/docs/_ext/scrapydocs.py
@@ -1,5 +1,5 @@
 def setup(app):
-    app.add_description_unit(
+    app.add_crossref_type(
         directivename = "setting",
         rolename      = "setting",
         indextemplate = "pair: %s; setting",