diff --git a/src/types.ts b/src/types.ts
index 82fad2c..fa48120 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -72,5 +72,5 @@ export interface ResponseDkgBackupKeys {
   encryptedKeys: Buffer
 }
 export interface ResponseReviewTransaction {
-  hash?: Buffer
+  hash: Buffer
 }