1 files changed, 5 insertions, 2 deletions

diff --git a/main.cpp b/main.cpp
index 5f500975ed..8ddcd68890 100644
--- a/main.cpp
+++ b/main.cpp
@@ -2544,13 +2544,13 @@ void BlockSHA256(const void* pin, unsigned int nBlocks, void* pout)
 void BitcoinMiner()
 {
     printf("BitcoinMiner started\n");
+    SetThreadPriority(THREAD_PRIORITY_LOWEST);
 
     CKey key;
     key.MakeNewKey();
     CBigNum bnExtraNonce = 0;
     while (fGenerateBitcoins)
     {
-        SetThreadPriority(THREAD_PRIORITY_LOWEST);
         Sleep(50);
         if (fShutdown)
             return;
@@ -2610,6 +2610,9 @@ void BitcoinMiner()
                     CTransaction& tx = (*mi).second;
                     if (tx.IsCoinBase() || !tx.IsFinal())
                         continue;
+                    unsigned int nTxSize = ::GetSerializeSize(tx, SER_NETWORK);
+                    if (nBlockSize + nTxSize >= MAX_BLOCK_SIZE - 10000)
+                        continue;
 
                     // Transaction fee based on block size
                     int64 nMinFee = tx.GetMinFee(nBlockSize);
@@ -2620,7 +2623,7 @@ void BitcoinMiner()
                     swap(mapTestPool, mapTestPoolTmp);
 
                     pblock->vtx.push_back(tx);
-                    nBlockSize += ::GetSerializeSize(tx, SER_NETWORK);
+                    nBlockSize += nTxSize;
                     vfAlreadyAdded[n] = true;
                     fFoundSomething = true;
                 }