diff --git a/test/javascripts/lib/markdown_test.js b/test/javascripts/lib/markdown_test.js
index c5cdc6108..d3c3ba1b7 100644
--- a/test/javascripts/lib/markdown_test.js
+++ b/test/javascripts/lib/markdown_test.js
@@ -50,6 +50,10 @@ test("Traditional Line Breaks", function() {
   cooked(input, traditionalOutput, "It supports traditional markdown via a Site Setting");
 });
 
+test("Unbalanced underscores", function() {
+  cooked("[evil_trout][1] hello_\n\n[1]: http://eviltrout.com", "<p><a href=\"http://eviltrout.com\">evil_trout</a> hello_</p>");
+});
+
 test("Line Breaks", function() {
   cooked("[] first choice\n[] second choice",
          "<p>[] first choice<br/>[] second choice</p>",
diff --git a/vendor/assets/javascripts/better_markdown.js b/vendor/assets/javascripts/better_markdown.js
index 93555f4c5..304606cdd 100644
--- a/vendor/assets/javascripts/better_markdown.js
+++ b/vendor/assets/javascripts/better_markdown.js
@@ -643,7 +643,8 @@
   var DialectHelpers = {};
   DialectHelpers.inline_until_char = function( text, want ) {
     var consumed = 0,
-        nodes = [];
+        nodes = [],
+        patterns = this.dialect.inline.__patterns__.replace('|_|', '');
 
     while ( true ) {
       if ( text.charAt( consumed ) === want ) {
@@ -657,7 +658,7 @@
         return null;
       }
 
-      var res = this.dialect.inline.__oneElement__.call(this, text.substr( consumed ) );
+      var res = this.dialect.inline.__oneElement__.call(this, text.substr( consumed ), patterns );
       consumed += res[ 0 ];
       // Add any returned nodes.
       nodes.push.apply( nodes, res.slice( 1 ) );