diff --git a/core/server/api/index.js b/core/server/api/index.js
index c3e611fcde..1b69e79444 100644
--- a/core/server/api/index.js
+++ b/core/server/api/index.js
@@ -99,7 +99,7 @@ cacheInvalidationHeader = function cacheInvalidationHeader(req, result) {
             if (hasStatusChanged || wasPublishedUpdated) {
                 return INVALIDATE_ALL;
             } else {
-                return '/' + config.routeKeywords.preview + '/' + post.uuid + '/';
+                return config.urlFor({relativeUrl: '/' + config.routeKeywords.preview + '/' + post.uuid + '/'});
             }
         }
     }