diff --git a/lib/inlines.js b/lib/inlines.js
index 6dc17a40..d3c60cc3 100644
--- a/lib/inlines.js
+++ b/lib/inlines.js
@@ -71,7 +71,7 @@ var reEmailAutolink = /^<([a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-
 
 var reAutolink = /^<[A-Za-z][A-Za-z0-9.+-]{1,31}:[^<>\x00-\x20]*>/i;
 
-var reSpnl = /^ *(?:\n *)?/;
+var reSpnl = /^[ \t]*(?:\n[ \t]*)?/;
 
 var reWhitespaceChar = /^[ \t\n\x0b\x0c\x0d]/;