diff --git a/web/includes/functions.php b/web/includes/functions.php
index 00d77fbbb..0600d4f60 100644
--- a/web/includes/functions.php
+++ b/web/includes/functions.php
@@ -2063,8 +2063,8 @@ function cache_bust( $file ) {
   global $css;
   $dirname = preg_replace( '/\//', '_', $parts['dirname'] );
   $cacheFile = $dirname.'_'.$parts['filename'].'-'.$css.'-'.filemtime($file).'.'.$parts['extension'];
-  if ( file_exists( ZM_DIR_CACHE.'/'.$cacheFile ) or symlink( ZM_PATH_WEB.'/'.$file, ZM_DIR_CACHE.'/'.$cacheFile ) ) {
-    return 'cache/'.$cacheFile;
+  if ( file_exists(ZM_DIR_CACHE.'/'.$cacheFile) or symlink(ZM_PATH_WEB.'/'.$file, ZM_DIR_CACHE.'/'.$cacheFile) ) {
+    return '/zm/cache/'.$cacheFile;
   } else {
     Warning("Failed linking $file to $cacheFile");
   }