diff --git a/src/dns_cache.c b/src/dns_cache.c
index d558072..6d81107 100644
--- a/src/dns_cache.c
+++ b/src/dns_cache.c
@@ -412,7 +412,37 @@ int dns_cache_get_ttl(struct dns_cache *dns_cache)
 	return ttl;
 }
 
-int dns_cache_is_soa(struct dns_cache *dns_cache) {
+int dns_cache_get_cname_ttl(struct dns_cache *dns_cache) 
+{
+	time_t now;
+	int ttl = 0;
+	time(&now);
+
+	struct dns_cache_addr *cache_addr = (struct dns_cache_addr *)dns_cache_get_data(dns_cache);
+
+	if (cache_addr->head.cache_type != CACHE_TYPE_ADDR) {
+		return 0;
+	}
+
+	ttl = dns_cache->info.insert_time + cache_addr->addr_data.cname_ttl - now;
+	if (ttl < 0) {
+		return 0;
+	}
+
+	int addr_ttl = dns_cache_get_ttl(dns_cache);
+	if (ttl < addr_ttl) {
+		return addr_ttl;
+	}
+
+	if (ttl < 0) {
+		return 0;
+	}
+
+	return ttl;	
+}
+
+int dns_cache_is_soa(struct dns_cache *dns_cache) 
+{
 	if (dns_cache == NULL) {
 		return 0;
 	}
diff --git a/src/dns_cache.h b/src/dns_cache.h
index d6443dd..1f66122 100644
--- a/src/dns_cache.h
+++ b/src/dns_cache.h
@@ -143,6 +143,8 @@ void dns_cache_invalidate(dns_cache_preinvalid_callback callback, int ttl_pre);
 
 int dns_cache_get_ttl(struct dns_cache *dns_cache);
 
+int dns_cache_get_cname_ttl(struct dns_cache *dns_cache);
+
 int dns_cache_is_soa(struct dns_cache *dns_cache);
 
 struct dns_cache_data *dns_cache_new_data(void);
diff --git a/src/dns_server.c b/src/dns_server.c
index 1fe7682..c4b9d5c 100644
--- a/src/dns_server.c
+++ b/src/dns_server.c
@@ -2349,6 +2349,17 @@ static int _dns_server_get_expired_ttl_reply(struct dns_cache *dns_cache)
 	return dns_conf_serve_expired_reply_ttl;
 }
 
+
+static int _dns_server_get_expired_cname_ttl_reply(struct dns_cache *dns_cache)
+{
+	int ttl = dns_cache_get_cname_ttl(dns_cache);
+	if (ttl > 0) {
+		return ttl;
+	}
+
+	return dns_conf_serve_expired_reply_ttl;
+}
+
 static int _dns_server_process_cache_addr(struct dns_request *request, struct dns_cache *dns_cache)
 {
 	struct dns_cache_addr *cache_addr = (struct dns_cache_addr *)dns_cache_get_data(dns_cache);
@@ -2376,7 +2387,7 @@ static int _dns_server_process_cache_addr(struct dns_request *request, struct dn
 	if (cache_addr->addr_data.cname[0] != 0) {
 		safe_strncpy(request->cname, cache_addr->addr_data.cname, DNS_MAX_CNAME_LEN);
 		request->has_cname = 1;
-		request->ttl_cname = cache_addr->addr_data.cname_ttl;
+		request->ttl_cname = _dns_server_get_expired_cname_ttl_reply(dns_cache);
 	}
 
 	request->rcode = DNS_RC_NOERROR;