diff --git a/libtransmission/torrent.c b/libtransmission/torrent.c
index 1c5bf0487..2e779cc1e 100644
--- a/libtransmission/torrent.c
+++ b/libtransmission/torrent.c
@@ -1869,10 +1869,11 @@ tr_torrentReqIsValid( const tr_torrent * tor,
     else if( tr_pieceOffset( tor, index, offset, length ) > tor->info.totalSize )
         err = 5;
 
-    if( err ) fprintf( stderr, "index %lu offset %lu length %lu err %d\n",
-                       (unsigned long)index, (unsigned long)offset,
-                       (unsigned long)length,
-                       err );
+    if( err ) tr_tordbg( tor, "index %lu offset %lu length %lu err %d\n",
+                              (unsigned long)index,
+                              (unsigned long)offset,
+                              (unsigned long)length,
+                              err );
 
     return !err;
 }