diff --git a/content/treestyletab/treestyletab.js b/content/treestyletab/treestyletab.js
index eb31ceb7..5ac2d808 100644
--- a/content/treestyletab/treestyletab.js
+++ b/content/treestyletab/treestyletab.js
@@ -403,7 +403,7 @@ var TreeStyleTabService = {
 
 		var str = aURI;
 		if (str instanceof Ci.nsIURI) str = aURI.spec;
-		return (/^\w+:\/\/([^:\/]+)/.test(getShortcutOrURI(str)) ?
+		return /^\w+:\/\/([^:\/]+)/.test(getShortcutOrURI(str)) ?
 				RegExp.$1 :
 				null ;
 	},