diff --git a/internal/datanode/segment_replica.go b/internal/datanode/segment_replica.go
index 8dd7705aae..b57e99774c 100644
--- a/internal/datanode/segment_replica.go
+++ b/internal/datanode/segment_replica.go
@@ -230,7 +230,7 @@ func (replica *SegmentReplica) addNewSegment(segID, collID, partitionID UniqueID
 		log.Warn("Mismatch collection",
 			zap.Int64("input ID", collID),
 			zap.Int64("expected ID", replica.collectionID))
-		return fmt.Errorf("Mismatch collection, ID=%d", collID)
+		return fmt.Errorf("mismatch collection, ID=%d", collID)
 	}
 
 	log.Debug("Add new segment",