diff --git a/util/copyrights b/util/copyrights
index 97d72950f5..b1a409e611 100644
--- a/util/copyrights
+++ b/util/copyrights
@@ -1912,7 +1912,7 @@
 ./lib/dns/result.c				C	1998,1999,2000,2001,2002,2003,2004,2005
 ./lib/dns/rootns.c				C	1999,2000,2001,2002,2004,2005
 ./lib/dns/sdb.c					C	2000,2001,2003,2004,2005
-./lib/dns/sdlz.c				C.PORTION	1991,2000,2001.2005,2005
+./lib/dns/sdlz.c				C.PORTION	1999,2000,2001,2005
 ./lib/dns/soa.c					C	2000,2001,2004,2005
 ./lib/dns/ssu.c					C	2000,2001,2003,2004,2005
 ./lib/dns/stats.c				C	2000,2001,2004,2005