diff --git a/picture.php b/picture.php
index dac560dfe..ee96083e8 100644
--- a/picture.php
+++ b/picture.php
@@ -947,6 +947,7 @@ if (isset($picture['next'])
   $template->assign('U_PREFETCH', $picture['next']['derivatives'][pwg_get_session_var('picture_deriv', IMG_LARGE)]->get_url() );
 }
 
+$template->assign('U_CANONICAL', make_picture_url( array('image_id'=>$picture['current']['id'], 'image_file'=>$picture['current']['file']) ) );
 
 // +-----------------------------------------------------------------------+
 // |                               sub pages                               |
diff --git a/themes/default/template/header.tpl b/themes/default/template/header.tpl
index 5dc51f97b..444b3fc2d 100644
--- a/themes/default/template/header.tpl
+++ b/themes/default/template/header.tpl
@@ -39,7 +39,8 @@
 {/foreach}
 
 
-{if isset($U_PREFETCH)          }<link rel="prefetch" href="{$U_PREFETCH}">{/if}
+{if isset($U_PREFETCH)}<link rel="prefetch" href="{$U_PREFETCH}">{/if}
+{if isset($U_CANONICAL)}<link rel="canonical" href="{$U_CANONICAL}">{/if}
 
 {if not empty($page_refresh)    }<meta http-equiv="refresh" content="{$page_refresh.TIME};url={$page_refresh.U_REFRESH}">{/if}