diff --git a/util/copyrights b/util/copyrights
index 009b5b65f8..2aac7057c3 100644
--- a/util/copyrights
+++ b/util/copyrights
@@ -3472,7 +3472,7 @@
 ./lib/dns/xfrin.c				C	1999,2000,2001,2002,2003,2004,2005,2006,2007,2008,2011,2012,2013,2014,2015
 ./lib/dns/zone.c				C	1999,2000,2001,2002,2003,2004,2005,2006,2007,2008,2009,2010,2011,2012,2013,2014,2015
 ./lib/dns/zonekey.c				C	2001,2003,2004,2005,2007
-./lib/dns/zt.c					C	1999,2000,2001,2002,2004,2005,2006,2007,2011,2012,2013,2014
+./lib/dns/zt.c					C	1999,2000,2001,2002,2004,2005,2006,2007,2011,2012,2013,2014,2015
 ./lib/irs/Makefile.in				MAKE	2009,2012,2014
 ./lib/irs/api					X	2009,2010,2011,2012,2013,2014,2015
 ./lib/irs/context.c				C	2009,2014