diff --git a/src/specificClass.js b/src/specificClass.js
index e78572f..bc3d079 100644
--- a/src/specificClass.js
+++ b/src/specificClass.js
@@ -75,6 +75,16 @@ class Reactor extends BaseDomain {
 
   updateState(t) { this.engine.updateState(t); this.notifyOutputChanged(); }
 
+  // Engine pass-through — needed so the BaseNodeAdapter tick loop (and
+  // tests calling reactor.tick(dt) directly) drive the ASM integration.
+  // Without this the Node-RED tick fires `source.tick?.()`, gets undefined,
+  // and the kinetics state never advances.
+  tick(timeStep) {
+    const result = this.engine.tick(timeStep);
+    this.notifyOutputChanged();
+    return result;
+  }
+
   get getEffluent()    { return this.engine.getEffluent; }
   get getGridProfile() { return this.engine.getGridProfile; }
   get temperature()    { return this.engine.temperature; }