diff --git a/ngx_tcp_upstream.c b/ngx_tcp_upstream.c
index 6070f13..395a2cb 100644
--- a/ngx_tcp_upstream.c
+++ b/ngx_tcp_upstream.c
@@ -79,14 +79,14 @@ static ngx_command_t  ngx_tcp_upstream_commands[] = {
       NGX_TCP_UPS_CONF|NGX_CONF_1MORE,
       ngx_conf_set_bitmask_slot,
       NGX_TCP_SRV_CONF_OFFSET,
-      offsetof(ngx_tcp_upstream_srv_conf_t, status_alive),
+      offsetof(ngx_tcp_upstream_srv_conf_t, code.status_alive),
       &ngx_check_http_expect_alive_masks },
 
     { ngx_string("check_smtp_expect_alive"),
       NGX_TCP_UPS_CONF|NGX_CONF_1MORE,
       ngx_conf_set_bitmask_slot,
       NGX_TCP_SRV_CONF_OFFSET,
-      offsetof(ngx_tcp_upstream_srv_conf_t, status_alive),
+      offsetof(ngx_tcp_upstream_srv_conf_t, code.status_alive),
       &ngx_check_smtp_expect_alive_masks },
 
     { ngx_string("check_shm_size"),
@@ -658,7 +658,7 @@ ngx_tcp_upstream_add(ngx_conf_t *cf, ngx_url_t *u, ngx_uint_t flags)
     uscf->line = cf->conf_file->line;
     uscf->port = u->port;
     uscf->default_port = u->default_port;
-    uscf->status_alive = 0;
+    uscf->code.status_alive = 0;
 
     if (u->naddrs == 1) {
         uscf->servers = ngx_array_create(cf->pool, 1,
diff --git a/ngx_tcp_upstream.h b/ngx_tcp_upstream.h
index d977538..42ea806 100644
--- a/ngx_tcp_upstream.h
+++ b/ngx_tcp_upstream.h
@@ -117,7 +117,7 @@ struct ngx_tcp_upstream_srv_conf_s {
     union {
         ngx_uint_t                       return_code;
         ngx_uint_t                       status_alive;
-    };
+    } code;
 };
 
 
diff --git a/ngx_tcp_upstream_check.c b/ngx_tcp_upstream_check.c
index 0e4dcc3..7cae4b7 100644
--- a/ngx_tcp_upstream_check.c
+++ b/ngx_tcp_upstream_check.c
@@ -788,12 +788,12 @@ ngx_tcp_check_http_parse(ngx_tcp_check_peer_conf_t *peer_conf)
 
         ngx_log_debug2(NGX_LOG_DEBUG_TCP, ngx_cycle->log, 0, 
                 "http_parse: hp->status_code_n: %d, conf: %d",
-                hp->status_code_n, uscf->status_alive);
+                hp->status_code_n, uscf->code.status_alive);
 
         if (hp->status_code_n == 0) {
             return NGX_AGAIN;
         }
-        else if (hp->status_code_n & uscf->status_alive) {
+        else if (hp->status_code_n & uscf->code.status_alive) {
             return NGX_OK;
         }
         else {
@@ -1068,12 +1068,12 @@ ngx_tcp_check_smtp_parse(ngx_tcp_check_peer_conf_t *peer_conf)
 
     ngx_log_debug2(NGX_LOG_DEBUG_TCP, ngx_cycle->log, 0, 
             "smtp_parse: sp->hello_reply_code: %d, conf: %d",
-            sp->hello_reply_code, uscf->status_alive);
+            sp->hello_reply_code, uscf->code.status_alive);
 
     if (sp->hello_reply_code == 0) {
         return NGX_AGAIN;
     }
-    else if (sp->hello_reply_code & uscf->status_alive) {
+    else if (sp->hello_reply_code & uscf->code.status_alive) {
         return NGX_OK;
     }
     else {
@@ -1605,8 +1605,8 @@ ngx_tcp_upstream_init_check_conf(ngx_tcp_upstream_srv_conf_t *uscf)
         uscf->send.len = cf->default_send.len;
     }
 
-    if (uscf->status_alive == 0) { 
-        uscf->status_alive = cf->default_status_alive;
+    if (uscf->code.status_alive == 0) { 
+        uscf->code.status_alive = cf->default_status_alive;
     }
 }