diff --git a/inc/parser/xhtml.php b/inc/parser/xhtml.php
index e397f5bd74d679c6deb1066f74ceb7ab2d03de2b..fad6f6120f4cded8d9565a2082e4494c7459c89f 100644
--- a/inc/parser/xhtml.php
+++ b/inc/parser/xhtml.php
@@ -931,6 +931,8 @@ class Doku_Renderer_xhtml extends Doku_Renderer {
                 if($cap){
                     $ret .= ' title="'.$this->_xmlEntities($cap).'"';
                     $ret .= ' alt="'.$this->_xmlEntities($cap).'"';
+                }else{
+                    $ret .= ' alt=""';
                 }
             }else{
                 $ret .= ' alt=""';