diff --git a/packages/node_modules/@node-red/nodes/core/network/10-mqtt.js b/packages/node_modules/@node-red/nodes/core/network/10-mqtt.js
index 901fc9819..9e6195b5d 100644
--- a/packages/node_modules/@node-red/nodes/core/network/10-mqtt.js
+++ b/packages/node_modules/@node-red/nodes/core/network/10-mqtt.js
@@ -592,7 +592,7 @@ module.exports = function(RED) {
                     // Only for ws or wss, check if proxy env var for additional configuration
                     if (node.brokerurl.indexOf("wss://") > -1 || node.brokerurl.indexOf("ws://") > -1) {
                         // check if proxy is set in env
-                        let prox, noprox;
+                        let prox, noprox, noproxy;
                         if (process.env.http_proxy) { prox = process.env.http_proxy; }
                         if (process.env.HTTP_PROXY) { prox = process.env.HTTP_PROXY; }
                         if (process.env.no_proxy) { noprox = process.env.no_proxy.split(","); }