diff --git a/bcf_sr_sort.c b/bcf_sr_sort.c
index 179a3492b..73be004c9 100644
--- a/bcf_sr_sort.c
+++ b/bcf_sr_sort.c
@@ -1,5 +1,5 @@
 /*
-    Copyright (C) 2017-2024 Genome Research Ltd.
+    Copyright (C) 2017-2021,2024 Genome Research Ltd.
 
     Author: Petr Danecek <pd3@sanger.ac.uk>
 
diff --git a/bcf_sr_sort.h b/bcf_sr_sort.h
index 705547f78..447e8bf7a 100644
--- a/bcf_sr_sort.h
+++ b/bcf_sr_sort.h
@@ -1,5 +1,5 @@
 /*
-    Copyright (C) 2017 Genome Research Ltd.
+    Copyright (C) 2017-2019,2024 Genome Research Ltd.
 
     Author: Petr Danecek <pd3@sanger.ac.uk>