--- a/src/http/ngx_http_core_module.c
+++ b/src/http/ngx_http_core_module.c
@@ -2606,20 +2606,7 @@ ngx_http_core_merge_srv_conf(ngx_conf_t 
     }
 
     if (conf->server_name.data == NULL) {
-        conf->server_name.data = ngx_palloc(cf->pool, NGX_MAXHOSTNAMELEN);
-        if (conf->server_name.data == NULL) {
-            return NGX_CONF_ERROR;
-        }
-
-        if (gethostname((char *) conf->server_name.data, NGX_MAXHOSTNAMELEN)
-            == -1)
-        {
-            ngx_conf_log_error(NGX_LOG_EMERG, cf, ngx_errno,
-                               "gethostname() failed");
-            return NGX_CONF_ERROR;
-        }
-
-        conf->server_name.len = ngx_strlen(conf->server_name.data);
+        conf->server_name = cf->cycle->hostname;
 
         sn = ngx_array_push(&conf->server_names);
         if (sn == NULL) {