diff --git a/lib/renderer.js b/lib/renderer.js
index 6a9e524..5a5d61f 100644
--- a/lib/renderer.js
+++ b/lib/renderer.js
@@ -43,7 +43,7 @@ default_rules.fence = function (tokens, idx, options, env, slf) {
       highlighted, i, tmpAttrs, tmpToken;
 
   if (info) {
-    langName = info.split(/\s+/g)[0];
+    langName = info.split(/\s+/g)[0].split(':')[0];
   }
 
   if (options.highlight) {