diff --git a/util/copyrights b/util/copyrights
index 6b31481b63..22de999dfd 100644
--- a/util/copyrights
+++ b/util/copyrights
@@ -3379,7 +3379,7 @@
 ./lib/dns/db.c					C	1999,2000,2001,2003,2004,2005,2007,2008,2009,2011,2012,2013,2015,2016
 ./lib/dns/dbiterator.c				C	1999,2000,2001,2004,2005,2007,2016
 ./lib/dns/dbtable.c				C	1999,2000,2001,2004,2005,2007,2013,2016
-./lib/dns/diff.c				C	2000,2001,2002,2003,2004,2005,2007,2008,2009,2011,2013,2014,2015,2016
+./lib/dns/diff.c				C	2000,2001,2002,2003,2004,2005,2007,2008,2009,2011,2013,2014,2015,2016,2017
 ./lib/dns/dispatch.c				C	1999,2000,2001,2002,2003,2004,2005,2006,2007,2008,2009,2011,2012,2013,2014,2015,2016,2017
 ./lib/dns/dlz.c					C.PORTION	1999,2000,2001,2005,2007,2009,2010,2011,2012,2013,2015,2016
 ./lib/dns/dns64.c				C	2010,2011,2014,2016,2017