diff --git a/core/src/main/java/hudson/model/Hudson.java b/core/src/main/java/hudson/model/Hudson.java
index 10802c23cdf499df00839b7786c9ed736fc8e6f5..0d660ad1d872c50a1c60fb4b981b439fc3cbc9b4 100644
--- a/core/src/main/java/hudson/model/Hudson.java
+++ b/core/src/main/java/hudson/model/Hudson.java
@@ -1761,10 +1761,7 @@ public final class Hudson extends View implements ItemGroup<TopLevelItem>, Node,
         String contentType = req.getServletContext().getMimeType(f.getPath());
         rsp.setContentType(contentType);
         rsp.setContentLength((int)f.length());
-        byte[] buf = new byte[1024];
-        int len;
-        while((len=in.read(buf))>0)
-            rsp.getOutputStream().write(buf,0,len);
+        Util.copyStream(in,rsp.getOutputStream());
         in.close();
     }