diff --git a/event/bus.go b/event/bus.go
index 028bde7b9ccc5b4450e1f039c65ac12d9fc99085..9dcf9378229eea6bf4b5d0e43d45752d117cc6f1 100644
--- a/event/bus.go
+++ b/event/bus.go
@@ -19,7 +19,7 @@ type Emitter interface {
 	// calls to Emit will block.
 	//
 	// Calling this function with wrong event type will cause a panic.
-	Emit(evt interface{})
+	Emit(evt interface{}) error
 }
 
 // Subscription represents a subscription to one or multiple event types.