diff --git a/doc/arm/reference.rst b/doc/arm/reference.rst
index 7c22ea289d..652c71903a 100644
--- a/doc/arm/reference.rst
+++ b/doc/arm/reference.rst
@@ -3062,9 +3062,6 @@ system.
 Periodic Task Intervals
 ^^^^^^^^^^^^^^^^^^^^^^^
 
-``cleaning-interval``
-   This option is obsolete.
-
 ``heartbeat-interval``
    The server performs zone maintenance tasks for all zones marked
    as ``dialup`` whenever this interval expires. The default is 60
diff --git a/lib/dns/cache.c b/lib/dns/cache.c
index 931340fe53..633fc5d122 100644
--- a/lib/dns/cache.c
+++ b/lib/dns/cache.c
@@ -76,7 +76,7 @@
 typedef struct cache_cleaner cache_cleaner_t;
 
 typedef enum {
-	cleaner_s_idle, /*%< Waiting for cleaning-interval to expire. */
+	cleaner_s_idle, /*%< Waiting for cleaning interval to expire. */
 	cleaner_s_busy, /*%< Currently cleaning. */
 	cleaner_s_done	/*%< Freed enough memory after being overmem. */
 } cleaner_state_t;
diff --git a/lib/isccfg/namedconf.c b/lib/isccfg/namedconf.c
index b3153d16e7..6f591e79b4 100644
--- a/lib/isccfg/namedconf.c
+++ b/lib/isccfg/namedconf.c
@@ -1977,7 +1977,7 @@ static cfg_clausedef_t view_clauses[] = {
 	{ "cache-file", &cfg_type_qstring, 0 },
 	{ "catalog-zones", &cfg_type_catz, 0 },
 	{ "check-names", &cfg_type_checknames, CFG_CLAUSEFLAG_MULTI },
-	{ "cleaning-interval", &cfg_type_uint32, CFG_CLAUSEFLAG_OBSOLETE },
+	{ "cleaning-interval", &cfg_type_uint32, CFG_CLAUSEFLAG_ANCIENT },
 	{ "clients-per-query", &cfg_type_uint32, 0 },
 	{ "deny-answer-addresses", &cfg_type_denyaddresses, 0 },
 	{ "deny-answer-aliases", &cfg_type_denyaliases, 0 },