diff --git a/effects/events.ts b/effects/events.ts
index a08e44088..38db4a321 100644
--- a/effects/events.ts
+++ b/effects/events.ts
@@ -34,7 +34,7 @@ export function events<Extrinsic extends SignedExtrinsic, FinalizedHash extends
     }, k2_)
 }
 
-export type ExtrinsicEvent = {
+export interface ExtrinsicEvent {
   event?: Record<string, any>
   phase: { value: number }
 }