diff --git a/src/main.cpp b/src/main.cpp
index 481adb10d..d104b7992 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -3789,7 +3789,7 @@ bool CheckBlock(int32_t height,CBlockIndex *pindex,const CBlock& block, CValidat
         komodo_block2pubkey33(pubkey33,(CBlock *)&block);
         if ( !CheckProofOfWork(height,pubkey33,hash,block.nBits,Params().GetConsensus(),block.nTime) )
         {
-            for (z=31; z>=0; z--)
+            int32_t z; for (z=31; z>=0; z--)
                 fprintf(stderr,"%02x",((uint8_t *)&hash)[z]);
             fprintf(stderr," failed hash ht.%d\n",height);
             return state.DoS(50, error("CheckBlock: proof of work failed"),REJECT_INVALID, "high-hash");