diff --git a/src/miner.cpp b/src/miner.cpp
index 087ff2f45..6dce2f9fa 100644
--- a/src/miner.cpp
+++ b/src/miner.cpp
@@ -831,7 +831,7 @@ void static BitcoinMiner()
                 }
             }
             IncrementExtraNonce(pblock, pindexPrev, nExtraNonce);
-            fprintf(stderr,"Running KomodoMiner.%s with %u transactions in block\n",solver.c_str(),pblock->vtx.size());
+            fprintf(stderr,"Running KomodoMiner.%s with %u transactions in block\n",solver.c_str(),(int32_t)pblock->vtx.size());
             LogPrintf("Running KomodoMiner.%s with %u transactions in block (%u bytes)\n",solver.c_str(),pblock->vtx.size(),::GetSerializeSize(*pblock,SER_NETWORK,PROTOCOL_VERSION));
             //
             // Search