diff --git a/src/http/modules/ngx_http_proxy_module.c b/src/http/modules/ngx_http_proxy_module.c
index a869e74..5005b6b 100644
--- a/src/http/modules/ngx_http_proxy_module.c
+++ b/src/http/modules/ngx_http_proxy_module.c
@@ -213,6 +213,7 @@
     { ngx_string("error"), NGX_HTTP_UPSTREAM_FT_ERROR },
     { ngx_string("timeout"), NGX_HTTP_UPSTREAM_FT_TIMEOUT },
     { ngx_string("invalid_header"), NGX_HTTP_UPSTREAM_FT_INVALID_HEADER },
+    { ngx_string("non_idempotent"), NGX_HTTP_UPSTREAM_FT_NON_IDEMPOTENT },
     { ngx_string("http_500"), NGX_HTTP_UPSTREAM_FT_HTTP_500 },
     { ngx_string("http_502"), NGX_HTTP_UPSTREAM_FT_HTTP_502 },
     { ngx_string("http_503"), NGX_HTTP_UPSTREAM_FT_HTTP_503 },