diff --git a/src/main.cpp b/src/main.cpp
index a04dfcd18..31fb1cb17 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -4498,7 +4498,7 @@ void static ProcessGetData(CNode* pfrom)
                             uint256 hash; int32_t z;
                             hash = block.GetHash();
                             for (z=0; z<32; z++)
-                                printf("%02x",((uint8_t *)&hash)[z]);
+                                fprintf(stderr,"%02x",((uint8_t *)&hash)[z]);
                             fprintf(stderr," send block %d\n",komodo_block2height(&block));
                             pfrom->PushMessage("block", block);
                         }