diff --git a/src/lib/events/bus.ts b/src/lib/events/bus.ts
index a3e90de..0cdf108 100644
--- a/src/lib/events/bus.ts
+++ b/src/lib/events/bus.ts
@@ -6,16 +6,21 @@ export type TicketEvent =
   | { type: "ticket.updated"; ticket: TicketDTO }
   | { type: "message.created"; ticketId: string; customerId: string; assigneeId: string | null; message: MessageDTO };
 
-// Next.js dev mode reloads this module on every edit — stash the emitter on
-// globalThis so hot reload doesn't spawn a second, disconnected bus.
+// Stashed on globalThis rather than relying on Node's module cache to give
+// us a singleton: Next.js dev mode reloads this module on every edit (hot
+// reload would otherwise spawn a second, disconnected bus), and — the
+// production-breaking case — Turbopack's route-level bundling can inline
+// this small module separately into each route's own chunk instead of
+// sharing one instance, so /api/events (the SSE subscriber) and whatever
+// publishes an event (ticket creation, mail ingestion, ...) can each end up
+// holding their own private EventEmitter that never sees the other's
+// events. globalThis is the one thing guaranteed to be the same object
+// across every chunk in the process, in both dev and production.
 const globalForBus = globalThis as unknown as { ticketEventBus?: EventEmitter };
 
 const emitter = globalForBus.ticketEventBus ?? new EventEmitter();
 emitter.setMaxListeners(200); // one per open SSE connection
-
-if (process.env.NODE_ENV !== "production") {
-  globalForBus.ticketEventBus = emitter;
-}
+globalForBus.ticketEventBus = emitter;
 
 const CHANNEL = "ticket-event";