diff --git a/lib/isccfg/include/isccfg/grammar.h b/lib/isccfg/include/isccfg/grammar.h
index 43947712da..45513d0e46 100644
--- a/lib/isccfg/include/isccfg/grammar.h
+++ b/lib/isccfg/include/isccfg/grammar.h
@@ -36,8 +36,7 @@
 #define CFG_CLAUSEFLAG_OBSOLETE 0x00000002
 /* obsolete: #define CFG_CLAUSEFLAG_NOTIMP 0x00000004 */
 /* obsolete: #define CFG_CLAUSEFLAG_NYI 0x00000008 */
-/*% Default value has changed since earlier release */
-#define CFG_CLAUSEFLAG_NEWDEFAULT 0x00000010
+/* obsolete: #define CFG_CLAUSEFLAG_NEWDEFAULT 0x00000010 */
 /*%
  * Clause needs to be interpreted during parsing
  * by calling a callback function, like the
diff --git a/lib/isccfg/namedconf.c b/lib/isccfg/namedconf.c
index 007ede844e..b3153d16e7 100644
--- a/lib/isccfg/namedconf.c
+++ b/lib/isccfg/namedconf.c
@@ -1973,7 +1973,7 @@ static cfg_clausedef_t view_clauses[] = {
 	{ "allow-v6-synthesis", &cfg_type_bracketed_aml,
 	  CFG_CLAUSEFLAG_OBSOLETE },
 	{ "attach-cache", &cfg_type_astring, 0 },
-	{ "auth-nxdomain", &cfg_type_boolean, CFG_CLAUSEFLAG_NEWDEFAULT },
+	{ "auth-nxdomain", &cfg_type_boolean, 0 },
 	{ "cache-file", &cfg_type_qstring, 0 },
 	{ "catalog-zones", &cfg_type_catz, 0 },
 	{ "check-names", &cfg_type_checknames, CFG_CLAUSEFLAG_MULTI },
diff --git a/lib/isccfg/parser.c b/lib/isccfg/parser.c
index 5d9790c32d..f4d9ba815a 100644
--- a/lib/isccfg/parser.c
+++ b/lib/isccfg/parser.c
@@ -2471,12 +2471,6 @@ cfg_parse_mapbody(cfg_parser_t *pctx, const cfg_type_t *type, cfg_obj_t **ret) {
 			CHECK(ISC_R_FAILURE);
 		}
 
-		/*
-		 * Don't log options with CFG_CLAUSEFLAG_NEWDEFAULT
-		 * set here - we need to log the *lack* of such an option,
-		 * not its presence.
-		 */
-
 		/* See if the clause already has a value; if not create one. */
 		result = isc_symtab_lookup(obj->value.map.symtab, clause->name,
 					   0, &symval);
@@ -2707,7 +2701,6 @@ static struct flagtext {
 	unsigned int flag;
 	const char *text;
 } flagtexts[] = { { CFG_CLAUSEFLAG_OBSOLETE, "obsolete" },
-		  { CFG_CLAUSEFLAG_NEWDEFAULT, "default changed" },
 		  { CFG_CLAUSEFLAG_TESTONLY, "test only" },
 		  { CFG_CLAUSEFLAG_NOTCONFIGURED, "not configured" },
 		  { CFG_CLAUSEFLAG_MULTI, "may occur multiple times" },