diff --git a/CHANGES b/CHANGES
index 1878322674..c8b8c6447d 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,7 @@
+6128.	[bug]		Fix an omission in an earlier commit to avoid a race
+			between the 'dns__catz_update_cb()' and
+			'dns_catz_dbupdate_callback()' functions. [GL #3968]
+
 6127.	[cleanup]	Refactor network manager netievent callbacks to
 			use isc_job_run()/isc_async_run(). [GL #3964]
 
diff --git a/lib/dns/catz.c b/lib/dns/catz.c
index 58cd369312..4dc8caaa3e 100644
--- a/lib/dns/catz.c
+++ b/lib/dns/catz.c
@@ -2234,7 +2234,7 @@ dns__catz_update_cb(void *data) {
 	uint32_t catz_vers;
 
 	REQUIRE(DNS_CATZ_ZONE_VALID(catz));
-	REQUIRE(DNS_DB_VALID(catz->db));
+	REQUIRE(DNS_DB_VALID(catz->updb));
 	REQUIRE(DNS_CATZ_ZONES_VALID(catz->catzs));
 
 	updb = catz->updb;