diff --git a/_layouts/page.html b/_layouts/page.html
index 78fe0769c6d53d342d55b2d75f280999639f7a3f..589609edce1f243db4b9f5382b0663ee0f8268c3 100644
--- a/_layouts/page.html
+++ b/_layouts/page.html
@@ -4,6 +4,6 @@ layout: default
 
 <h1 id="title-heading" class="page-title">{{ page.title }}</h1>
 
-{% include page_toc.html html=content hmax=3 %}
+{% include page_toc.html html=content h_max=3 %}
 
 {{ content }}