diff --git a/IPython/nbconvert/templates/html/full.tpl b/IPython/nbconvert/templates/html/full.tpl
index c16fc35..df1a486 100644
--- a/IPython/nbconvert/templates/html/full.tpl
+++ b/IPython/nbconvert/templates/html/full.tpl
@@ -38,7 +38,7 @@ pre {
 <link rel="stylesheet" href="custom.css">
 
 <!-- Loading mathjax macro -->
-mathjax()
+{{ mathjax() }}
 
 </head>
 {%- endblock header -%}
diff --git a/IPython/nbconvert/templates/html/slides_reveal.tpl b/IPython/nbconvert/templates/html/slides_reveal.tpl
index 41601c1..e24ec8d 100644
--- a/IPython/nbconvert/templates/html/slides_reveal.tpl
+++ b/IPython/nbconvert/templates/html/slides_reveal.tpl
@@ -141,7 +141,7 @@ dependencies: [
 </script>
 
 <!-- Loading mathjax macro -->
-mathjax()
+{{ mathjax() }}
 
 <script>
 Reveal.addEventListener( 'slidechanged', function( event ) {