diff --git a/src/dns_client.c b/src/dns_client.c
index 9fff80a..4a67211 100644
--- a/src/dns_client.c
+++ b/src/dns_client.c
@@ -186,6 +186,7 @@ struct dns_client {
 	/* query list */
 	struct list_head dns_request_list;
 	pthread_cond_t run_cond;
+	atomic_t run_period;
 	atomic_t dns_server_num;
 
 	/* ECS */
@@ -1312,7 +1313,12 @@ static int _dns_client_server_pending(char *server_ip, int port, dns_server_type
 
 	pthread_mutex_lock(&pending_server_mutex);
 	list_add_tail(&pending->list, &pending_servers);
+	atomic_set(&client.run_period, 1);
 	pthread_mutex_unlock(&pending_server_mutex);
+
+	pthread_mutex_lock(&client.domain_map_lock);
+	pthread_cond_signal(&client.run_cond);
+	pthread_mutex_unlock(&client.domain_map_lock);
 	return 0;
 errout:
 	if (pending) {
@@ -3266,6 +3272,12 @@ static void _dns_client_add_pending_servers(void)
 	dely = 0;
 
 	pthread_mutex_lock(&pending_server_mutex);
+	if (list_empty(&pending_servers)) {
+		atomic_set(&client.run_period, 0);
+	} else {
+		atomic_set(&client.run_period, 1);
+	}
+
 	list_for_each_entry_safe(pending, tmp, &pending_servers, list)
 	{
 		list_add(&pending->retry_list, &retry_list);
@@ -3436,7 +3448,7 @@ static void *_dns_client_work(void *arg)
 		}
 
 		pthread_mutex_lock(&client.domain_map_lock);
-		if (list_empty(&client.dns_request_list)) {
+		if (list_empty(&client.dns_request_list) && atomic_read(&client.run_period) == 0) {
 			pthread_cond_wait(&client.run_cond, &client.domain_map_lock);
 			expect_time = get_tick_count();
 			pthread_mutex_unlock(&client.domain_map_lock);
@@ -3519,6 +3531,7 @@ int dns_client_init(void)
 	memset(&client, 0, sizeof(client));
 	pthread_attr_init(&attr);
 	atomic_set(&client.dns_server_num, 0);
+	atomic_set(&client.run_period, 0);
 
 	epollfd = epoll_create1(EPOLL_CLOEXEC);
 	if (epollfd < 0) {