diff --git a/jar/jar.go b/jar/jar.go
index f17bc98..08fa1ab 100644
--- a/jar/jar.go
+++ b/jar/jar.go
@@ -94,6 +94,8 @@
 		Method:             zip.Store,
 		UncompressedSize64: uint64(len(b)),
 	}
+	fh.SetMode(0700)
+	fh.SetModTime(DefaultTime)
 
 	return fh, b, nil
 }