diff --git a/index.php b/index.php
index d66da41e..afe2d039 100644
--- a/index.php
+++ b/index.php
@@ -904,9 +904,9 @@ function showRSS()
         $absurl = htmlspecialchars($link['url']);
         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
         if ($usepermalinks===true)
-            echo '<item><title>'.htmlspecialchars($link['title']).'</title><guid>'.$guid.'</guid><link>'.$guid.'</link>';
+            echo '<item><title>'.htmlspecialchars($link['title']).'</title><guid isPermaLink="false">'.$guid.'</guid><link>'.$guid.'</link>';
         else
-            echo '<item><title>'.htmlspecialchars($link['title']).'</title><guid>'.$guid.'</guid><link>'.$absurl.'</link>';
+            echo '<item><title>'.htmlspecialchars($link['title']).'</title><guid isPermaLink="false">'.$guid.'</guid><link>'.$absurl.'</link>';
         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) echo '<pubDate>'.htmlspecialchars($rfc822date)."</pubDate>\n";
         if ($link['tags']!='') // Adding tags to each RSS entry (as mentioned in RSS specification)
         {