diff --git a/src/common/services/CoreService.ts b/src/common/services/CoreService.ts
index c8c77c7d..df9161e9 100644
--- a/src/common/services/CoreService.ts
+++ b/src/common/services/CoreService.ts
@@ -9,7 +9,6 @@ import { IDecPrivateModes, ICharset } from 'common/Types';
 import { clone } from 'common/Clone';
 
 const DEFAULT_DEC_PRIVATE_MODES: IDecPrivateModes = Object.freeze({
-  altEscMode: true,
   applicationCursorKeys: false,
   applicationKeypad: false,
   origin: false,