diff --git a/iguana/iguana_unspents.c b/iguana/iguana_unspents.c
index ddb923ecf..e475d7c1d 100755
--- a/iguana/iguana_unspents.c
+++ b/iguana/iguana_unspents.c
@@ -470,7 +470,7 @@ int32_t iguana_balancegen(struct iguana_info *coin,struct iguana_bundle *bp,int3
         now = (uint32_t)time(NULL);
         if ( spentbp != 0 && unspentind > 0 && unspentind < spentbp->ramchain.H.data->numunspents )
         {
-            if ( spentbp->dirty++ > 100 )
+            if ( spentbp->dirty++ == 100 )
             {
                 printf("prefetch.[%d]\n",spentbp->hdrsi);
                 iguana_ramchain_prefetch(coin,&spentbp->ramchain);