diff --git a/app/views/layouts/_piwik.html.haml b/app/views/layouts/_piwik.html.haml
index a888e8ae18788efd08bd1aa4882a6fcb73b9be8a..473b14ce626ac1835636c27974b30283ae79abae 100644
--- a/app/views/layouts/_piwik.html.haml
+++ b/app/views/layouts/_piwik.html.haml
@@ -7,7 +7,7 @@
   (function() {
     var u="//#{extra_config.piwik_url}/";
     _paq.push(['setTrackerUrl', u+'piwik.php']);
-    _paq.push(['setSiteId', #{extra_config.piwik_site_id}]);
+    _paq.push(['setSiteId', "#{extra_config.piwik_site_id}"]);
     var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0];
     g.type='text/javascript'; g.async=true; g.defer=true; g.src=u+'piwik.js'; s.parentNode.insertBefore(g,s);
   })();