diff --git a/read.go b/read.go
index eb8b9aa..e2af860 100644
--- a/read.go
+++ b/read.go
@@ -1052,7 +1052,7 @@ func decryptStream(key []byte, useAES bool, ptr objptr, rd io.Reader) io.Reader
 		rd = &cbcReader{cbc: cbc, rd: rd, buf: make([]byte, 16)}
 	} else {
 		c, _ := rc4.NewCipher(key)
-		rd = &cipher.StreamReader{c, rd}
+		rd = &cipher.StreamReader{S: c, R: rd}
 	}
 	return rd
 }