diff --git a/packages/node_modules/@node-red/nodes/core/network/10-mqtt.html b/packages/node_modules/@node-red/nodes/core/network/10-mqtt.html
index 5b1b1f799..009076cf9 100644
--- a/packages/node_modules/@node-red/nodes/core/network/10-mqtt.html
+++ b/packages/node_modules/@node-red/nodes/core/network/10-mqtt.html
@@ -653,7 +653,7 @@
                 this.protocolVersion = 4;
             }
             $("#node-config-input-cleansession").on("change", function() {
-                var useCleanSession = $("#node-config-input-cleansession").is(':checked');
+                const useCleanSession = $("#node-config-input-cleansession").is(':checked');
                 if(useCleanSession) {
                     $("div.form-row.mqtt-persistence").hide();
                 } else {