diff --git a/lib/framework.php b/lib/framework.php
index 77f2d0526a..56a382aa65 100644
--- a/lib/framework.php
+++ b/lib/framework.php
@@ -66,6 +66,7 @@ define('URL_REGEX_VALID_PATH_CHARS',        '\pN\pL\,\!\.\:\-\_\+\/\@\=\;\%\~\*'
 define('URL_REGEX_VALID_QSTRING_CHARS',     URL_REGEX_VALID_PATH_CHARS    . '\&');
 define('URL_REGEX_VALID_FRAGMENT_CHARS',    URL_REGEX_VALID_QSTRING_CHARS . '\?\#');
 define('URL_REGEX_EXCLUDED_END_CHARS',      '\?\.\,\!\#\:\'');  // don't include these if they are directly after a URL
+define('URL_REGEX_DOMAIN_NAME', '(?:(?!-)[A-Za-z0-9\-]{1,63}(?<!-)\.)+[A-Za-z]{2,10}');
 
 // append our extlib dir as the last-resort place to find libs
 
diff --git a/plugins/OStatus/OStatusPlugin.php b/plugins/OStatus/OStatusPlugin.php
index 4bfd0ea23f..55a50d12c0 100644
--- a/plugins/OStatus/OStatusPlugin.php
+++ b/plugins/OStatus/OStatusPlugin.php
@@ -264,7 +264,7 @@ class OStatusPlugin extends Plugin
     static function extractWebfingerIds($text)
     {
         $wmatches = array();
-        $result = preg_match_all('/(?:^|\s+)@((?:\w+[\w\-\_\.]?)*(?:[\w\-\_\.]*\w+)@(?:(?!-)[A-Za-z0-9\-]{1,63}(?<!-)\.)+[A-Za-z]{2,10})/',
+        $result = preg_match_all('/(?:^|\s+)@((?:\w+[\w\-\_\.]?)*(?:[\w\-\_\.]*\w+)@'.URL_REGEX_DOMAIN_NAME.')/',
                        $text,
                        $wmatches,
                        PREG_OFFSET_CAPTURE);
@@ -284,7 +284,7 @@ class OStatusPlugin extends Plugin
     static function extractUrlMentions($text)
     {
         $wmatches = array();
-        $result = preg_match_all('!(?:^|\s+)@((?:\w+\.)*\w+(?:\w+\-\w+)*\.\w+(?:/\w+)*)!',
+        $result = preg_match_all('!(?:^|\s+)@'.URL_REGEX_DOMAIN_NAME.'(?:/\w+)*)!',
                        $text,
                        $wmatches,
                        PREG_OFFSET_CAPTURE);