diff --git a/internal/datacoord/segment_manager.go b/internal/datacoord/segment_manager.go
index bfaed8bd50..42fbc13900 100644
--- a/internal/datacoord/segment_manager.go
+++ b/internal/datacoord/segment_manager.go
@@ -321,7 +321,7 @@ func (s *SegmentManager) openNewSegment(ctx context.Context, collectionID Unique
 func (s *SegmentManager) estimateMaxNumOfRows(collectionID UniqueID) (int, error) {
 	collMeta := s.meta.GetCollection(collectionID)
 	if collMeta == nil {
-		return -1, fmt.Errorf("Failed to get collection %d", collectionID)
+		return -1, fmt.Errorf("failed to get collection %d", collectionID)
 	}
 	return s.estimatePolicy(collMeta.Schema)
 }