diff --git a/Parsedown.php b/Parsedown.php
index b087741..20db134 100755
--- a/Parsedown.php
+++ b/Parsedown.php
@@ -418,7 +418,7 @@ class Parsedown
 
     protected function identifyFencedCode($Line)
     {
-        if (preg_match('/^(['.$Line['text'][0].']{3,})[ ]*(\w+)?[ ]*$/', $Line['text'], $matches))
+        if (preg_match('/^(['.$Line['text'][0].']{3,})[ ]*([\w-]+)?[ ]*$/', $Line['text'], $matches))
         {
             $Element = array(
                 'name' => 'code',