diff --git a/lib/util.php b/lib/util.php
index 292045928d..b831859e99 100644
--- a/lib/util.php
+++ b/lib/util.php
@@ -442,9 +442,9 @@ function common_replace_urls_callback($text, $callback, $notice_id = null) {
         ')'.
         '(?:'.
             '(?:\:\d+)?'. //:port
-            '(?:/[\pN\pL$\[\]\,\!\(\)\.\:\-\_\+\/\=\&\;\%\~\*\$\+\'\"]*)?'. // /path
-            '(?:\?[\pN\pL\$\[\]\,\!\(\)\.\:\-\_\+\/\=\&\;\%\~\*\$\+\'\"\/]*)?'. // ?query string
-            '(?:\#[\pN\pL$\[\]\,\!\(\)\.\:\-\_\+\/\=\&\;\%\~\*\$\+\'\"\/\?\#]*)?'. // #fragment
+            '(?:/[\pN\pL$\[\]\,\!\(\)\.\:\-\_\+\/\=\&\;\%\~\*\$\+\'\"@]*)?'. // /path
+            '(?:\?[\pN\pL\$\[\]\,\!\(\)\.\:\-\_\+\/\=\&\;\%\~\*\$\+\'\"@\/]*)?'. // ?query string
+            '(?:\#[\pN\pL$\[\]\,\!\(\)\.\:\-\_\+\/\=\&\;\%\~\*\$\+\'\"\@/\?\#]*)?'. // #fragment
         ')(?<![\?\.\,\#\,])'.
     ')'.
     '#ixu';
diff --git a/tests/URLDetectionTest.php b/tests/URLDetectionTest.php
index 87b5376467..1c3f7cd96f 100644
--- a/tests/URLDetectionTest.php
+++ b/tests/URLDetectionTest.php
@@ -27,6 +27,8 @@ class URLDetectionTest extends PHPUnit_Framework_TestCase
         return array(
                      array('not a link :: no way',
                            'not a link :: no way'),
+                     array('link http://www.somesite.com/xyz/35637563@N00/52803365/ link',
+                           'link <a href="http://www.somesite.com/xyz/35637563@N00/52803365/" rel="external">http://www.somesite.com/xyz/35637563@N00/52803365/</a> link'),
                      array('http://127.0.0.1',
                            '<a href="http://127.0.0.1/" rel="external">http://127.0.0.1</a>'),
                      array('127.0.0.1',