diff --git a/application/libraries/Paths.php b/application/libraries/Paths.php
index 9d4d262aa..7c1ad66b6 100644
--- a/application/libraries/Paths.php
+++ b/application/libraries/Paths.php
@@ -32,4 +32,12 @@ class Paths
         }
         return $datadir . "/" . $path;
 	}
+
+    function cache_buster($filepath) {
+        $fullpath = $_SERVER['DOCUMENT_ROOT'] . $filepath;
+        if (file_exists($fullpath)) {
+            return base_url($filepath) . '?v=' . filemtime($fullpath);
+        }
+        return base_url($filepath);
+    }
 }