diff --git a/packages/node_modules/@node-red/editor-client/src/js/ui/editor.js b/packages/node_modules/@node-red/editor-client/src/js/ui/editor.js
index 7bf279ff5..d55161adc 100644
--- a/packages/node_modules/@node-red/editor-client/src/js/ui/editor.js
+++ b/packages/node_modules/@node-red/editor-client/src/js/ui/editor.js
@@ -1068,7 +1068,7 @@ RED.editor = (function() {
         hasNonBlankLabel = false;
         newValue = new Array(editing_node.outputs);
         outputLabels.each(function() {
-            var index = $(this).attr('id').substring(23); // red-ui-editor-node-label-form-output-<index>
+            var index = $(this).attr('id').substring("red-ui-editor-node-label-form-output-".length);
             if (outputMap && outputMap.hasOwnProperty(index)) {
                 index = parseInt(outputMap[index]);
                 if (index === -1) {