diff --git a/lib/processor.js b/lib/processor.js
index 113b289a..8ded5d41 100644
--- a/lib/processor.js
+++ b/lib/processor.js
@@ -80,7 +80,7 @@ function preprocess(text) {
             var comments = [];
             var index, previousNode, comment;
 
-            if (node.lang && SUPPORTED_SYNTAXES.indexOf(node.lang.toLowerCase()) >= 0) {
+            if (node.lang && SUPPORTED_SYNTAXES.indexOf(node.lang.split(" ")[0].toLowerCase()) >= 0) {
                 index = parent.children.indexOf(node) - 1;
                 previousNode = parent.children[index];
                 while (previousNode && previousNode.type === "html") {