diff --git a/src/crypto/backup.ts b/src/crypto/backup.ts
index 82f90a6c7..161e7b40f 100644
--- a/src/crypto/backup.ts
+++ b/src/crypto/backup.ts
@@ -49,6 +49,8 @@ type SigInfo = {
 export type TrustInfo = {
     usable: boolean; // is the backup trusted, true iff there is a sig that is valid & from a trusted device
     sigs: SigInfo[];
+    // eslint-disable-next-line camelcase
+    trusted_locally?: boolean;
 };
 
 export interface IKeyBackupCheck {