diff --git a/src/constants.js b/src/constants.js
index b76e4b3..6505feb 100644
--- a/src/constants.js
+++ b/src/constants.js
@@ -38,7 +38,7 @@ module.exports = function (S) {
     S.MAINNET_SCRIPT_ADDRESS_BYTE_PREFIX = [5];
     S.TESTNET_SCRIPT_ADDRESS_BYTE_PREFIX = [196];
     S.MAINNET_SEGWIT_ADDRESS_BYTE_PREFIX = [3, 3, 3, 0, 2, 7, 12];
-    S.TESTNET_SEGWIT_ADDRESS_BYTE_PREFIX = [3, 3, 0, 20, 2];
+    S.TESTNET_SEGWIT_ADDRESS_BYTE_PREFIX = [3, 3, 3, 3, 0, 20, 2, 7, 12];
     S.TESTNET_PRIVATE_KEY_BYTE_PREFIX = [0xef];
     S.MAINNET_PRIVATE_KEY_BYTE_PREFIX = [0x80];
     S.MAINNET_PRIVATE_KEY_UNCOMPRESSED_PREFIX = MAINNET_PRIVATE_KEY_UNCOMPRESSED_PREFIX;