diff --git a/lib/marked.js b/lib/marked.js
index e71eb623..5b405576 100644
--- a/lib/marked.js
+++ b/lib/marked.js
@@ -21,7 +21,7 @@ var block = {
   blockquote: /^( *>[^\n]+(\n[^\n]+)*\n*)+/,
   list: /^( *)(bull) [\s\S]+?(?:hr|\n{2,}(?! )(?!\1bull )\n*|\s*$)/,
   html: /^ *(?:comment|closed|closing) *(?:\n{2,}|\s*$)/,
-  def: /^ *\[([^\]]+)\]: *([^\s]+)(?: +["(]([^\n]+)[")])? *(?:\n+|$)/,
+  def: /^ *\[([^\]]+)\]: *<?([^\s]+)>?(?: +["(]([^\n]+)[")])? *(?:\n+|$)/,
   table: noop,
   paragraph: /^((?:[^\n]+\n?(?!hr|heading|lheading|blockquote|tag|def))+)\n*/,
   text: /^[^\n]+/