diff --git a/lib/gollum/frontend/public/gollum/livepreview/js/pagedown/Markdown.Sanitizer.js b/lib/gollum/frontend/public/gollum/livepreview/js/pagedown/Markdown.Sanitizer.js
index cc5826fa..eecd069e 100644
--- a/lib/gollum/frontend/public/gollum/livepreview/js/pagedown/Markdown.Sanitizer.js
+++ b/lib/gollum/frontend/public/gollum/livepreview/js/pagedown/Markdown.Sanitizer.js
@@ -22,7 +22,8 @@
     // (tags that can be opened/closed) | (tags that stand alone)
     var basic_tag_whitelist = /^(<\/?(b|blockquote|code|del|dd|dl|dt|em|h1|h2|h3|i|kbd|li|ol|p|pre|s|sup|sub|strong|strike|ul)>|<(br|hr)\s?\/?>)$/i;
     // <a href="url..." optional title>|</a>
-    var a_white = /^(<a\shref="((https?|ftp):\/\/|\/)[-A-Za-z0-9+&@#\/%?=~_|!:,.;\(\)]+"(\stitle="[^"<>]+")?\s?>|<\/a>)$/i;
+    // Make https:// ftp:// prefix optional so relative links work. <a href="page1">page one</a>
+    var a_white = /^(<a\shref="(((https?|ftp):\/\/|\/))?[-A-Za-z0-9+&@#\/%?=~_|!:,.;\(\)]+"(\stitle="[^"<>]+")?\s?>|<\/a>)$/i;
 
     // <img src="url..." optional width  optional height  optional alt  optional title
     var img_white = /^(<img\ssrc="(https?:\/\/|\/)[-A-Za-z0-9+&@#\/%?=~_|!:,.;\(\)]+"(\swidth="\d{1,3}")?(\sheight="\d{1,3}")?(\salt="[^"<>]*")?(\stitle="[^"<>]*")?\s?\/?>)$/i;