diff --git a/assets/js/tracking.js b/assets/js/tracking.js
index fe23c09..49ddbb9 100644
--- a/assets/js/tracking.js
+++ b/assets/js/tracking.js
@@ -3,7 +3,7 @@
  * A JavaScript file for analytic tracking.
  */
 
-var idSite = {{ .Site.Params.piwikSiteID }};
+var idSite = '{{ .Site.Params.piwikSiteID }}';
 var matomoTrackingApiUrl = 'https://{{ .Site.Params.piwikTrackerUrl }}/matomo.php';
 
 var _paq = window._paq || [];
@@ -12,7 +12,7 @@ _paq.push(['setSiteId', idSite]);
 _paq.push(['trackPageView']);
 _paq.push(['enableLinkTracking']);
 
-var googleAnalytics = {{ .Site.GoogleAnalytics }};
+var googleAnalytics = '{{ .Site.GoogleAnalytics }}';
 
 var _gaq = window._gaq || [];
 _gaq.push(['_setAccount', googleAnalytics]);