diff --git a/templates/include/post-render.tmpl b/templates/include/post-render.tmpl
index c4ed082..beb98aa 100644
--- a/templates/include/post-render.tmpl
+++ b/templates/include/post-render.tmpl
@@ -68,7 +68,7 @@
       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-','');
+        lang = lb[i].className.replace('language-','').toLowerCase();
         // Support the aliases specified above
         if (aliasmap[lang]) lang = aliasmap[lang];
         lurl = hlbaseUri + "highlightjs/" + lang + ".min.js";