diff --git a/site/site.hs b/site/site.hs
index ed20659e2..29caf93c7 100644
--- a/site/site.hs
+++ b/site/site.hs
@@ -29,6 +29,7 @@ main = do
           pandocCompilerWith
             def
             def{writerTableOfContents=True
+               ,writerTOCDepth=4
                ,writerStandalone=True
                ,writerTemplate="<div id=toc>$toc$</div>\n$body$"
                }