diff --git a/packages/node_modules/@node-red/runtime/lib/flows/index.js b/packages/node_modules/@node-red/runtime/lib/flows/index.js
index 39ea6b6ed..af5663771 100644
--- a/packages/node_modules/@node-red/runtime/lib/flows/index.js
+++ b/packages/node_modules/@node-red/runtime/lib/flows/index.js
@@ -424,7 +424,7 @@ function stop(type,diff,muteLog) {
     });
 
     return Promise.all(promises).then(function() {
-        for (id in activeNodesToFlow) {
+        for (let id in activeNodesToFlow) {
             if (activeNodesToFlow.hasOwnProperty(id)) {
                 if (!activeFlows[activeNodesToFlow[id]]) {
                     delete activeNodesToFlow[id];