diff --git a/src/js/bitcoinjs-extensions.js b/src/js/bitcoinjs-extensions.js
index e7d6bfc..3ab395d 100644
--- a/src/js/bitcoinjs-extensions.js
+++ b/src/js/bitcoinjs-extensions.js
@@ -330,7 +330,7 @@ bitcoinjs.bitcoin.networks.komodo = {
 };
 
 bitcoinjs.bitcoin.networks.blackcoin = {
-  messagePrefix: '\x18Blackcoin Signed Message:\n',
+  messagePrefix: '\x18BlackCoin Signed Message:\n',
   bip32: {
     public: 0x02CFBEDE,
     private: 0x02CFBF60