diff --git a/src/http/ngx_http_upstream_round_robin.c b/src/http/ngx_http_upstream_round_robin.c
index c4998fc..4b78cff 100644
--- a/src/http/ngx_http_upstream_round_robin.c
+++ b/src/http/ngx_http_upstream_round_robin.c
@@ -430,6 +430,10 @@
     if (rrp->peers->single) {
         peer = &rrp->peers->peer[0];
 
+        if (peer->down) {
+            goto failed;
+        }
+
     } else {
 
         /* there are several peers */