diff --git a/lib/classes/ForumEntry.php b/lib/classes/ForumEntry.php
index cc0e959583248ec6cee49a49be01329b30eb8fa4..f98e59cd7a121dc1dd14b88c3d3c112d5de11a21 100644
--- a/lib/classes/ForumEntry.php
+++ b/lib/classes/ForumEntry.php
@@ -815,7 +815,7 @@ class ForumEntry  implements PrivacyObject
                 }
 
                 if ($options['search_author']) {
-                    $zw_search_string[] = "author LIKE " . DBManager::get()->quote($search_word);
+                    $zw_search_string[] = "(anonymous = 0 AND author LIKE " . DBManager::get()->quote($search_word) . ')';
                 }
 
                 if (!empty($zw_search_string)) {