diff --git a/packages/node_modules/@node-red/nodes/core/function/89-delay.js b/packages/node_modules/@node-red/nodes/core/function/89-delay.js
index 6d4843caf..0b9ca412f 100644
--- a/packages/node_modules/@node-red/nodes/core/function/89-delay.js
+++ b/packages/node_modules/@node-red/nodes/core/function/89-delay.js
@@ -229,6 +229,7 @@ module.exports = function(RED) {
             node.on("input", function(msg, send, done) {
                 if (!node.drop) {
                     var m = RED.util.cloneMessage(msg);
+                    delete m.flush;
                     if (Object.keys(m).length > 1) {
                         if (node.intervalID !== -1) {
                             if (node.allowrate && m.hasOwnProperty("rate") && !isNaN(parseFloat(m.rate)) && node.rate !== m.rate) {