diff --git a/scripts/compress-worker.js b/scripts/compress-worker.js
index 3bcb9084eefe66be2a79a346f1f10241f7a7afff..4ffb923334576fe0c511821d5c1c4eeb8bc994e9 100644
--- a/scripts/compress-worker.js
+++ b/scripts/compress-worker.js
@@ -84,7 +84,7 @@ function compressResource(staticPath, name, files, cb) {
 var static_root = path.join(__dirname, '..', 'resources/static/');
 logger.info("cachify will look in " + static_root);
 // Cachify only used in compress for CSS Images, so no asserts needed
-cachify.setup({}, { root: static_root});
+cachify.setup({}, { prefix: 'v', root: static_root });
 
 function cachify_embedded (css_src) {
   return css_src.replace(/url\s*\(['"](.*)\s*['"]\s*\)/g, function (str, url) {
@@ -105,4 +105,4 @@ process.on('message', function(m) {
       info: info
     });
   });
-});
\ No newline at end of file
+});