diff --git a/src/main.cpp b/src/main.cpp
index b97f04f63..1b88aecf7 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -2845,7 +2845,7 @@ namespace {
         hasher << hashBlock;
         hasher << blockundo;
         fileout << hasher.GetHash();
-fprintf(stderr,"hashBlock.%s hasher.%s\n",hashBlock.GetHex().c_str(),hasher.GetHash().GetHex().c_str());
+//fprintf(stderr,"hashBlock.%s hasher.%s\n",hashBlock.GetHex().c_str(),hasher.GetHash().GetHex().c_str());
         return true;
     }