diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c
index bb8964add..914f8e2bc 100644
--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -3511,7 +3511,7 @@ ngx_http_upstream_send_response(ngx_http_request_t *r, ngx_http_upstream_t *u)
 #endif
 
     } else {
-        p->temp_file->log_level = NGX_LOG_WARN;
+        p->temp_file->log_level = NGX_LOG_INFO;
         p->temp_file->warn = "an upstream response is buffered "
                              "to a temporary file";
     }