diff --git a/lib/isc/netmgr/udp.c b/lib/isc/netmgr/udp.c
index 75adf44671..be043c14a4 100644
--- a/lib/isc/netmgr/udp.c
+++ b/lib/isc/netmgr/udp.c
@@ -110,7 +110,7 @@ start_udp_child(isc_nm_t *mgr, isc_sockaddr_t *iface, isc_nmsocket_t *sock,
 	} else {
 		csock->fd = dup(fd);
 	}
-	REQUIRE(csock->fd >= 0);
+	INSIST(csock->fd >= 0);
 
 	ievent = isc__nm_get_netievent_udplisten(worker, csock);
 
@@ -198,7 +198,7 @@ isc_nm_listenudp(isc_nm_t *mgr, uint32_t workers, isc_sockaddr_t *iface,
 
 		return (result);
 	}
-	REQUIRE(atomic_load(&sock->rchildren) == sock->nchildren);
+	INSIST(atomic_load(&sock->rchildren) == sock->nchildren);
 	*sockp = sock;
 	return (ISC_R_SUCCESS);
 }