diff --git a/src/masternode.cpp b/src/masternode.cpp
index 5928aba9a..b425b09c4 100644
--- a/src/masternode.cpp
+++ b/src/masternode.cpp
@@ -159,8 +159,14 @@ uint256 CMasternode::CalculateScore(int mod, int64_t nBlockHeight)
 
     if(!GetBlockHash(hash, nBlockHeight)) return 0;
 
-    uint256 hash2 = Hash(BEGIN(hash), END(hash));
-    uint256 hash3 = Hash(BEGIN(hash), END(hash), BEGIN(aux), END(aux));
+    CHashWriter ss(SER_GETHASH, PROTOCOL_VERSION);
+    ss << hash;
+    uint256 hash2 = ss.GetHash();
+
+    CHashWriter ss2(SER_GETHASH, PROTOCOL_VERSION);
+    ss2 << hash;
+    ss2 << aux;
+    uint256 hash3 = ss2.GetHash();
 
     uint256 r = (hash3 > hash2 ? hash3 - hash2 : hash2 - hash3);