diff --git a/bitcoin.cpp b/bitcoin.cpp
index cf1c016..934ef60 100644
--- a/bitcoin.cpp
+++ b/bitcoin.cpp
@@ -6,7 +6,7 @@
 #include "serialize.h"
 #include "uint256.h"
 
-#define BITCOIN_SEED_NONCE  0x0539a019ca550825
+#define BITCOIN_SEED_NONCE  0x0539a019ca550825ULL
 
 using namespace std;