diff --git a/packages/node_modules/@node-red/nodes/core/function/15-change.js b/packages/node_modules/@node-red/nodes/core/function/15-change.js
index ee0e8d9c7..0bbd81955 100644
--- a/packages/node_modules/@node-red/nodes/core/function/15-change.js
+++ b/packages/node_modules/@node-red/nodes/core/function/15-change.js
@@ -233,7 +233,9 @@ module.exports = function(RED) {
                                                     // only replace if they match exactly
                                                     RED.util.setMessageProperty(msg,property,value);
                                                 } else {
-                                                    current = current.replace(fromRE,value);
+                                                    // if target is boolean then just replace it
+                                                    if (rule.tot === "bool") { current = value; }
+                                                    else { current = current.replace(fromRE,value); }
                                                     RED.util.setMessageProperty(msg,property,current);
                                                 }
                                             } else if ((typeof current === 'number' || current instanceof Number) && fromType === 'num') {