diff --git a/src/miner.cpp b/src/miner.cpp
index 466533ebb..7aedb7a34 100644
--- a/src/miner.cpp
+++ b/src/miner.cpp
@@ -207,12 +207,12 @@ CBlockTemplate* CreateNewBlock(CPubKey _pk,const CScript& _scriptPubKeyIn, int32
 
     // How much of the block should be dedicated to high-priority transactions,
     // included regardless of the fees they pay
-    const unsigned int nBlockPrioritySize = std::min( nBlockMaxSize, GetArg("-blockprioritysize", DEFAULT_BLOCK_PRIORITY_SIZE) );
+    const unsigned int nBlockPrioritySize = std::min( nBlockMaxSize, (unsigned int) GetArg("-blockprioritysize", DEFAULT_BLOCK_PRIORITY_SIZE) );
     // nBlockPrioritySize = std::min(nBlockMaxSize, nBlockPrioritySize);
 
     // Minimum block size you want to create; block will be filled with free transactions
     // until there are no more or the block reaches this size:
-    const unsigned int nBlockMinSize = std::min(nBlockMaxSize,  GetArg("-blockminsize", DEFAULT_BLOCK_MIN_SIZE));
+    const unsigned int nBlockMinSize = std::min(nBlockMaxSize,  (unsigned int) GetArg("-blockminsize", DEFAULT_BLOCK_MIN_SIZE));
     // nBlockMinSize = std::min(nBlockMaxSize, nBlockMinSize);
     //fprintf(stderr,"%s: nBlockMaxSize=%u, nBlockPrioritySize=%u, nBlockMinSize=%u\n", __func__, nBlockMaxSize, nBlockPrioritySize, nBlockMinSize);