diff --git a/lib/api/middlewares/last-modified-header.js b/lib/api/middlewares/last-modified-header.js
index 3f6c6e6a..4d1fad52 100644
--- a/lib/api/middlewares/last-modified-header.js
+++ b/lib/api/middlewares/last-modified-header.js
@@ -10,7 +10,9 @@ module.exports = function setLastModifiedHeader () {
 
         if (cache_buster) {
             const cacheBuster = parseInt(cache_buster, 10);
-            const lastModifiedDate = Number.isFinite(cacheBuster) ? new Date(cacheBuster) : new Date();
+            const lastModifiedDate = Number.isFinite(cacheBuster) &&  cacheBuster !== 0
+                ? new Date(cacheBuster)
+                : new Date();
 
             res.set('Last-Modified', lastModifiedDate.toUTCString());