diff --git a/src/core.h b/src/core.h
index c86e1f499..cba3ab233 100644
--- a/src/core.h
+++ b/src/core.h
@@ -672,4 +672,65 @@ public:
 };
 
 
+/** Nodes collect new transactions into a block, hash them into a hash tree,
+ * and scan through nonce values to make the block's hash satisfy proof-of-work
+ * requirements.  When they solve the proof-of-work, they broadcast the block
+ * to everyone and the block is added to the block chain.  The first transaction
+ * in the block is a special one that creates a new coin owned by the creator
+ * of the block.
+ */
+class CBlockHeader
+{
+public:
+    // header
+    static const int CURRENT_VERSION=2;
+    int nVersion;
+    uint256 hashPrevBlock;
+    uint256 hashMerkleRoot;
+    unsigned int nTime;
+    unsigned int nBits;
+    unsigned int nNonce;
+
+    CBlockHeader()
+    {
+        SetNull();
+    }
+
+    IMPLEMENT_SERIALIZE
+    (
+        READWRITE(this->nVersion);
+        nVersion = this->nVersion;
+        READWRITE(hashPrevBlock);
+        READWRITE(hashMerkleRoot);
+        READWRITE(nTime);
+        READWRITE(nBits);
+        READWRITE(nNonce);
+    )
+
+    void SetNull()
+    {
+        nVersion = CBlockHeader::CURRENT_VERSION;
+        hashPrevBlock = 0;
+        hashMerkleRoot = 0;
+        nTime = 0;
+        nBits = 0;
+        nNonce = 0;
+    }
+
+    bool IsNull() const
+    {
+        return (nBits == 0);
+    }
+
+    uint256 GetHash() const
+    {
+        return Hash(BEGIN(nVersion), END(nNonce));
+    }
+
+    int64 GetBlockTime() const
+    {
+        return (int64)nTime;
+    }
+};
+
 #endif
diff --git a/src/main.cpp b/src/main.cpp
index 28b32101d..bd40476d4 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1300,13 +1300,13 @@ bool ConnectBestBlock(CValidationState &state) {
     } while(true);
 }
 
-void CBlockHeader::UpdateTime(const CBlockIndex* pindexPrev)
+void UpdateTime(CBlockHeader& block, const CBlockIndex* pindexPrev)
 {
-    nTime = max(pindexPrev->GetMedianTimePast()+1, GetAdjustedTime());
+    block.nTime = max(pindexPrev->GetMedianTimePast()+1, GetAdjustedTime());
 
     // Updating time can change work required on testnet:
     if (fTestNet)
-        nBits = GetNextWorkRequired(pindexPrev, this);
+        block.nBits = GetNextWorkRequired(pindexPrev, &block);
 }
 
 
@@ -4366,7 +4366,7 @@ CBlockTemplate* CreateNewBlock(CReserveKey& reservekey)
 
         // Fill in header
         pblock->hashPrevBlock  = pindexPrev->GetBlockHash();
-        pblock->UpdateTime(pindexPrev);
+        UpdateTime(*pblock, pindexPrev);
         pblock->nBits          = GetNextWorkRequired(pindexPrev, pblock);
         pblock->nNonce         = 0;
         pblock->vtx[0].vin[0].scriptSig = CScript() << OP_0 << OP_0;
@@ -4606,7 +4606,7 @@ void static BitcoinMiner(CWallet *pwallet)
                 break;
 
             // Update nTime every few seconds
-            pblock->UpdateTime(pindexPrev);
+            UpdateTime(*pblock, pindexPrev);
             nBlockTime = ByteReverse(pblock->nTime);
             if (fTestNet)
             {
diff --git a/src/main.h b/src/main.h
index 1279e62ca..f4e80c85c 100644
--- a/src/main.h
+++ b/src/main.h
@@ -180,6 +180,9 @@ bool GetTransaction(const uint256 &hash, CTransaction &tx, uint256 &hashBlock, b
 bool SetBestChain(CValidationState &state, CBlockIndex* pindexNew);
 /** Find the best known block, and make it the tip of the block chain */
 bool ConnectBestBlock(CValidationState &state);
+
+void UpdateTime(CBlockHeader& block, const CBlockIndex* pindexPrev);
+
 /** Create a new block index entry for a given block hash */
 CBlockIndex * InsertBlockIndex(uint256 hash);
 /** Verify a signature */
@@ -576,69 +579,6 @@ public:
 };
 
 
-/** Nodes collect new transactions into a block, hash them into a hash tree,
- * and scan through nonce values to make the block's hash satisfy proof-of-work
- * requirements.  When they solve the proof-of-work, they broadcast the block
- * to everyone and the block is added to the block chain.  The first transaction
- * in the block is a special one that creates a new coin owned by the creator
- * of the block.
- */
-class CBlockHeader
-{
-public:
-    // header
-    static const int CURRENT_VERSION=2;
-    int nVersion;
-    uint256 hashPrevBlock;
-    uint256 hashMerkleRoot;
-    unsigned int nTime;
-    unsigned int nBits;
-    unsigned int nNonce;
-
-    CBlockHeader()
-    {
-        SetNull();
-    }
-
-    IMPLEMENT_SERIALIZE
-    (
-        READWRITE(this->nVersion);
-        nVersion = this->nVersion;
-        READWRITE(hashPrevBlock);
-        READWRITE(hashMerkleRoot);
-        READWRITE(nTime);
-        READWRITE(nBits);
-        READWRITE(nNonce);
-    )
-
-    void SetNull()
-    {
-        nVersion = CBlockHeader::CURRENT_VERSION;
-        hashPrevBlock = 0;
-        hashMerkleRoot = 0;
-        nTime = 0;
-        nBits = 0;
-        nNonce = 0;
-    }
-
-    bool IsNull() const
-    {
-        return (nBits == 0);
-    }
-
-    uint256 GetHash() const
-    {
-        return Hash(BEGIN(nVersion), END(nNonce));
-    }
-
-    int64 GetBlockTime() const
-    {
-        return (int64)nTime;
-    }
-
-    void UpdateTime(const CBlockIndex* pindexPrev);
-};
-
 class CBlock : public CBlockHeader
 {
 public:
diff --git a/src/rpcmining.cpp b/src/rpcmining.cpp
index d2cac6870..6f8ac7a11 100644
--- a/src/rpcmining.cpp
+++ b/src/rpcmining.cpp
@@ -159,7 +159,7 @@ Value getwork(const Array& params, bool fHelp)
         CBlock* pblock = &pblocktemplate->block; // pointer for convenience
 
         // Update nTime
-        pblock->UpdateTime(pindexPrev);
+        UpdateTime(*pblock, pindexPrev);
         pblock->nNonce = 0;
 
         // Update nExtraNonce
@@ -289,7 +289,7 @@ Value getblocktemplate(const Array& params, bool fHelp)
     CBlock* pblock = &pblocktemplate->block; // pointer for convenience
 
     // Update nTime
-    pblock->UpdateTime(pindexPrev);
+    UpdateTime(*pblock, pindexPrev);
     pblock->nNonce = 0;
 
     Array transactions;