diff --git a/lib/plugins/tag/img.js b/lib/plugins/tag/img.js
index 9886c3fd6f..994b04266e 100644
--- a/lib/plugins/tag/img.js
+++ b/lib/plugins/tag/img.js
@@ -40,6 +40,7 @@ module.exports = function(ctx) {
     var height;
     var title;
     var alt;
+    var lazysrc = '';
     var src;
     var item = '';
     var i = 0;
@@ -85,7 +86,14 @@ module.exports = function(ctx) {
       alt = match[2];
     }
 
+    // Find lazy load classname
+    if (classes[0] === 'lazy') {
+      lazysrc = src;
+      src = '/images/loading.gif';
+    }
+
     var attrs = {
+      'data-original': lazysrc,
       src: src,
       class: classes.join(' '),
       width: width,