diff --git a/lib/middleware/staticCache.js b/lib/middleware/staticCache.js
index 3ec5e425b..3db492fbb 100644
--- a/lib/middleware/staticCache.js
+++ b/lib/middleware/staticCache.js
@@ -81,6 +81,9 @@ module.exports = function staticCache(options){
       // ignore larger files
       if (!contentLength || contentLength > maxlen) return;
 
+      //don't cache partial files
+      if (headers['content-range']) return;
+
       // dont cache items we shouldn't be
       // TODO: real support for must-revalidate / no-cache
       if ( cc['no-cache']