diff --git a/lib/models/links.js b/lib/models/links.js
index 79d09633..418b31b8 100644
--- a/lib/models/links.js
+++ b/lib/models/links.js
@@ -272,7 +272,7 @@ module.exports.updateLinks = (campaign, list, subscription, serviceUrl, message,
     // insert tracking image
     let inserted = false;
     let imgUrl = urllib.resolve(serviceUrl, util.format('/links/%s/%s/%s', campaign.cid, list.cid, encodeURIComponent(subscription.cid)));
-    let img = '<img src="' + imgUrl + '" width="1" height="1">';
+    let img = '<img src="' + imgUrl + '" width="1" height="1" alt="Tracking Image">';
     message = message.replace(/<\/body\b/i, match => {
         inserted = true;
         return img + match;