diff --git a/proxy/proxy.conf b/proxy/proxy.conf
index d3cd4d2..8f9f192 100644
--- a/proxy/proxy.conf
+++ b/proxy/proxy.conf
@@ -24,7 +24,7 @@ server {
             rewrite_by_lua_block {
                   local http = require("resty.http").new()
 
-                  local res, err = http:request_uri("http://127.0.0.1:3000/containers/" .. ngx.var.container .. "/ip")
+                  local res = http:request_uri("http://127.0.0.1:3000/containers/" .. ngx.var.container .. "/ip")
                   ngx.var.ip = res.body
             }