diff --git a/eth/tracers/firehose.go b/eth/tracers/firehose.go
index cb78e9b91b68..6bf662877819 100644
--- a/eth/tracers/firehose.go
+++ b/eth/tracers/firehose.go
@@ -1514,6 +1514,10 @@ func (f *Firehose) printBlockToFirehose(block *pbeth.Block, finalityStatus *Fina
 		}
 	}
 
+	if block.Number-libNum >= 200 {
+		libNum = block.Number - 200
+	}
+
 	// **Important* The final space in the Sprintf template is mandatory!
 	f.outputBuffer.WriteString(fmt.Sprintf("FIRE BLOCK %d %s %d %s %d %d ", block.Number, hex.EncodeToString(block.Hash), previousNum, previousHash, libNum, block.Time().UnixNano()))