diff --git a/classes/Notice.php b/classes/Notice.php
index 93e94230d9..6d75cbcade 100644
--- a/classes/Notice.php
+++ b/classes/Notice.php
@@ -1366,12 +1366,21 @@ class Notice extends Memcached_DataObject
     {
         $author = Profile::staticGet('id', $this->profile_id);
 
-        // FIXME: truncate on long repeats...?
-
         $content = sprintf(_('RT @%1$s %2$s'),
                            $author->nickname,
                            $this->content);
 
+        $maxlen = common_config('site', 'textlimit');
+        if (mb_strlen($content) > $maxlen) {
+            // Web interface and current Twitter API clients will
+            // pull the original notice's text, but some older
+            // clients and RSS/Atom feeds will see this trimmed text.
+            //
+            // Unfortunately this is likely to lose tags or URLs
+            // at the end of long notices.
+            $content = mb_substr($content, 0, $maxlen - 4) . ' ...';
+        }
+
         return self::saveNew($repeater_id, $content, $source,
                              array('repeat_of' => $this->id));
     }