diff --git a/scram.nimble b/scram.nimble
index 85a8404..00ea346 100644
--- a/scram.nimble
+++ b/scram.nimble
@@ -1,4 +1,4 @@
-version       = "0.1.6"
+version       = "0.1.7"
 author        = "Huy Doan"
 description   = "Salted Challenge Response Authentication Mechanism (SCRAM) "
 license       = "MIT"
diff --git a/scram/private/types.nim b/scram/private/types.nim
index 96aff92..c38a8ee 100644
--- a/scram/private/types.nim
+++ b/scram/private/types.nim
@@ -16,6 +16,6 @@ type
 
 const
   GS2_HEADER* = "n,,"
-  INT_1* = "\x0\x0\x0\x1"
+  INT_1* = "\x00\x00\x00\x01"
   CLIENT_KEY* = "Client Key"
   SERVER_KEY* = "Server Key"
diff --git a/scram/private/utils.nim b/scram/private/utils.nim
index b436385..bee0b59 100644
--- a/scram/private/utils.nim
+++ b/scram/private/utils.nim
@@ -1,4 +1,7 @@
 import random, base64, strutils, types, hmac, sha1
+from md5 import MD5Digest
+from nimSHA2 import Sha256Digest, Sha512Digest
+
 randomize()
 
 proc `$`*(sha: Sha1Digest): string = sha.toHex()