diff --git a/lib/weblib.php b/lib/weblib.php
index 73e1a22d3f8..b55816955d0 100644
--- a/lib/weblib.php
+++ b/lib/weblib.php
@@ -180,12 +180,16 @@ function addslashes_js($var) {
 }
 
 /**
- * Returns the URL of the HTTP_REFERER, less the querystring portion
+ * Returns the URL of the HTTP_REFERER, less the querystring portion if required
  * @return string
  */
-function get_referer() {
+function get_referer($stripquery=true) {
     if (isset($_SERVER['HTTP_REFERER'])) {
-        return strip_querystring($_SERVER['HTTP_REFERER']);
+        if ($stripquery) {
+            return strip_querystring($_SERVER['HTTP_REFERER']);
+        } else {
+            return $_SERVER['HTTP_REFERER'];
+        }
     } else {
         return '';
     }
diff --git a/mod/forum/post.php b/mod/forum/post.php
index 19951d7f6e6..1d2113aee43 100644
--- a/mod/forum/post.php
+++ b/mod/forum/post.php
@@ -66,7 +66,7 @@
                   '', '', true, "", navmenu($course, $cm));
         }
         notice_yesno(get_string('noguestpost', 'forum').'<br /><br />'.get_string('liketologin'),
-                     $wwwroot, $_SERVER['HTTP_REFERER']);
+                     $wwwroot, get_referer(false));
         print_footer($course);
         exit;
     }