diff --git a/types/index.d.ts b/types/index.d.ts
index 6b5892fe6..1ca10f237 100644
--- a/types/index.d.ts
+++ b/types/index.d.ts
@@ -4,7 +4,7 @@
 export {};
 
 export class Account {
-  constructor(accountId: string, sequence: string | number);
+  constructor(accountId: string, sequence: string);
   accountId(): string;
   sequenceNumber(): string;
   incrementSequenceNumber(): void;