diff --git a/event.ts b/event.ts
index 0ba5498..d85f5c1 100644
--- a/event.ts
+++ b/event.ts
@@ -98,7 +98,7 @@ export function validateEvent(event: UnsignedEvent): boolean {
   return true
 }
 
-export function verifySignature(event: Event & {sig: string}): boolean {
+export function verifySignature(event: Event): boolean {
   return secp256k1.schnorr.verifySync(
     event.sig,
     getEventHash(event),
diff --git a/filter.ts b/filter.ts
index e27ee0d..d9ed8f2 100644
--- a/filter.ts
+++ b/filter.ts
@@ -13,7 +13,7 @@ export type Filter = {
 
 export function matchFilter(
   filter: Filter,
-  event: Event & {id: string}
+  event: Event
 ): boolean {
   if (filter.ids && filter.ids.indexOf(event.id) === -1) return false
   if (filter.kinds && filter.kinds.indexOf(event.kind) === -1) return false
@@ -42,7 +42,7 @@ export function matchFilter(
 
 export function matchFilters(
   filters: Filter[],
-  event: Event & {id: string}
+  event: Event
 ): boolean {
   for (let i = 0; i < filters.length; i++) {
     if (matchFilter(filters[i], event)) return true