diff --git a/lib/Zonemaster/Engine/Test/Nameserver.pm b/lib/Zonemaster/Engine/Test/Nameserver.pm
index af226e0cc..48348a7b6 100644
--- a/lib/Zonemaster/Engine/Test/Nameserver.pm
+++ b/lib/Zonemaster/Engine/Test/Nameserver.pm
@@ -378,7 +378,7 @@ Readonly my %TAG_DESCRIPTIONS => (
     },
     UNKNOWN_OPTION_CODE => sub {
         __x    # NAMESERVER:UNKNOWN_OPTION_CODE
-          'Nameserver {ns} responds with an unknown ENDS OPTION-CODE.', @_;
+          'Nameserver {ns} responds with an unknown EDNS OPTION-CODE.', @_;
     },
     UNSUPPORTED_EDNS_VER => sub {
         __x    # NAMESERVER:UNSUPPORTED_EDNS_VER