diff --git a/plugin/bbb/lib/bbb.lib.php b/plugin/bbb/lib/bbb.lib.php
index 174da2b64e..6a4419299d 100755
--- a/plugin/bbb/lib/bbb.lib.php
+++ b/plugin/bbb/lib/bbb.lib.php
@@ -108,7 +108,7 @@ class bbb
             }
 
             if (api_is_anonymous()) {
-                $this->userCompleteName = get_lang('Guest').rand(1000, 9999);
+                $this->userCompleteName = get_lang('Guest').'_'.rand(1000, 9999);
             }
 
             $this->salt = $bbb_salt;