diff --git a/src/miner.cpp b/src/miner.cpp
index bea69ad1b..3ecf1609e 100644
--- a/src/miner.cpp
+++ b/src/miner.cpp
@@ -141,7 +141,7 @@ public:
     }
 };
 
-CBlockTemplate* CreateNewBlock(CScript& scriptPubKeyIn)
+CBlockTemplate* CreateNewBlock(const CScript& scriptPubKeyIn)
 {
     // Create new block
     auto_ptr<CBlockTemplate> pblocktemplate(new CBlockTemplate());
diff --git a/src/miner.h b/src/miner.h
index 0bc76be10..36d58be00 100644
--- a/src/miner.h
+++ b/src/miner.h
@@ -11,7 +11,7 @@
 /** Run the miner threads */
 void GenerateBitcoins(bool fGenerate, CWallet* pwallet);
 /** Generate a new block, without valid proof-of-work */
-CBlockTemplate* CreateNewBlock(CScript& scriptPubKeyIn);
+CBlockTemplate* CreateNewBlock(const CScript& scriptPubKeyIn);
 CBlockTemplate* CreateNewBlockWithKey(CReserveKey& reservekey);
 /** Modify the extranonce in a block */
 void IncrementExtraNonce(CBlock* pblock, CBlockIndex* pindexPrev, unsigned int& nExtraNonce);