diff --git a/templates/include/post-render.tmpl b/templates/include/post-render.tmpl
index 8e694a0..7079ccd 100644
--- a/templates/include/post-render.tmpl
+++ b/templates/include/post-render.tmpl
@@ -1,73 +1,74 @@
 <!-- Miscelaneous render related template parts we use multiple times -->
 {{define "highlighting"}}
 <script>
   // TODO: this feels more like a mutation observer
   addEventListener('DOMContentLoaded', function () {
     var hlbaseUri = "https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.13.1/";
     var lb = document.querySelectorAll("code[class^='language-']");
 
     // Set langs to the langs that are included by default (for now: 'common set' on CDN)
     var langs = ["apache", "bash", "coffeescript", "cpp", "cs", "css", "diff",
                  "http", "ini", "java", "javascript", "json", "makefile", "xml",
                  "markdown", "nginx", "objectivec", "perl", "php", "properties",
                  "python", "ruby", "shell", "sql"];
 
     // Given a set of nodes, run highlighting on them
     function highlight(nodes) {
       for (i=0; i < nodes.length; i++) {
           hljs.highlightBlock(nodes[i]);
       }
     }
 
     // Given a array of URIs, load them in order
     function loadLanguages(uris, callback) {
       uris.forEach(function(uri) {
 	var sc=document.createElement('script');
 	sc.src=uri; sc.async=false; // critical?
 	if( uris.indexOf(uri) == uris.length-1) {
 	  sc.onload = callback;
 	}
 	document.head.appendChild(sc);
       });
     }
 
     // We don't have to do anything if there are no language blocks
     if (lb.length > 0) {
       // We have blocks to be highlighted, so we load css
       var st = document.createElement('link');
       st.rel = "stylesheet";
       st.href = hlbaseUri + "styles/atom-one-light.min.css";
       document.head.appendChild(st);
 
       // Construct set of files to load, in order
       var jss = [hlbaseUri + "highlight.min.js"];
       // Check what we need to load
       for (i=0; i < lb.length; i++) {
         lang = lb[i].className.replace('language-','');
-	if (!langs.includes(lang)) {
-	  jss.push(hlbaseUri + "languages/" + lang + ".min.js");
+	lurl = hlbaseUri + "languages/" + lang + ".min.js";
+	if (!(langs.includes(lang) || jss.includes(lurl))) {
+	  jss.push(lurl);
 	}
       }
       // Load files in order, higlight on last load
       loadLanguages(jss, () => {highlight(lb)});
     }
   });
 </script>
 {{end}}
 
 <!-- Include mathjax configuration -->
 {{define "mathjax"}}
 <script type="text/x-mathjax-config">
   MathJax.Hub.Config({
     extensions: ["tex2jax.js"],
     jax: ["input/TeX", "output/HTML-CSS"],
     tex2jax: {
       inlineMath: [ ['$','$'], ["\\(","\\)"] ],
       displayMath: [ ['$$','$$'], ["\\[","\\]"] ],
       processEscapes: true
     },
     "HTML-CSS": { fonts: ["TeX"] }
   });
 </script>
 <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/MathJax.js?config=TeX-MML-AM_CHTML" async></script>
 {{end}}