diff --git a/src/InputHandler.ts b/src/InputHandler.ts
index 681fc7a4b..a154379a3 100644
--- a/src/InputHandler.ts
+++ b/src/InputHandler.ts
@@ -1421,7 +1421,7 @@ export class InputHandler extends Disposable implements IInputHandler {
           break;
         case 66:
           this._logService.debug('Serial port requested application keypad.');
-          this._terminal.applicationKeypad = true;
+          this._coreService.decPrivateModes.applicationKeypad = true;
           if (this._terminal.viewport) {
             this._terminal.viewport.syncScrollArea();
           }
@@ -1604,7 +1604,7 @@ export class InputHandler extends Disposable implements IInputHandler {
           break;
         case 66:
           this._logService.debug('Switching back to normal keypad.');
-          this._terminal.applicationKeypad = false;
+          this._coreService.decPrivateModes.applicationKeypad = false;
           if (this._terminal.viewport) {
             this._terminal.viewport.syncScrollArea();
           }
@@ -1964,7 +1964,7 @@ export class InputHandler extends Disposable implements IInputHandler {
   public softReset(params: IParams): void {
     this._coreService.isCursorHidden = false;
     this._terminal.insertMode = false;
-    this._terminal.applicationKeypad = false; // ?
+    this._coreService.decPrivateModes.applicationKeypad = false; // ?
     if (this._terminal.viewport) {
       this._terminal.viewport.syncScrollArea();
     }
@@ -2086,7 +2086,7 @@ export class InputHandler extends Disposable implements IInputHandler {
    */
   public keypadApplicationMode(): void {
     this._logService.debug('Serial port requested application keypad.');
-    this._terminal.applicationKeypad = true;
+    this._coreService.decPrivateModes.applicationKeypad = true;
     if (this._terminal.viewport) {
       this._terminal.viewport.syncScrollArea();
     }
@@ -2099,7 +2099,7 @@ export class InputHandler extends Disposable implements IInputHandler {
    */
   public keypadNumericMode(): void {
     this._logService.debug('Switching back to normal keypad.');
-    this._terminal.applicationKeypad = false;
+    this._coreService.decPrivateModes.applicationKeypad = false;
     if (this._terminal.viewport) {
       this._terminal.viewport.syncScrollArea();
     }
diff --git a/src/Terminal.ts b/src/Terminal.ts
index 0a76aa62a..6d0bbea23 100644
--- a/src/Terminal.ts
+++ b/src/Terminal.ts
@@ -112,8 +112,6 @@ export class Terminal extends Disposable implements ITerminal, IDisposable, IInp
   private _soundService: ISoundService;
 
   // modes
-  public applicationKeypad: boolean;
-  public originMode: boolean;
   public insertMode: boolean;
   public bracketedPasteMode: boolean;
 
@@ -250,10 +248,7 @@ export class Terminal extends Disposable implements ITerminal, IDisposable, IInp
     this._customKeyEventHandler = null;
 
     // modes
-    this.applicationKeypad = false;
-    this.originMode = false;
     this.insertMode = false;
-    // this._coreService.decPrivateModes.wraparound = true;
     this.bracketedPasteMode = false;
 
     // charset
diff --git a/src/TestUtils.test.ts b/src/TestUtils.test.ts
index b3aa73582..cf23b8eb4 100644
--- a/src/TestUtils.test.ts
+++ b/src/TestUtils.test.ts
@@ -201,9 +201,6 @@ export class MockInputHandlingTerminal implements IInputHandlingTerminal {
   options: ITerminalOptions = {};
   cols: number;
   rows: number;
-  applicationKeypad: boolean;
-  applicationCursor: boolean;
-  originMode: boolean;
   insertMode: boolean;
   bracketedPasteMode: boolean;
   curAttrData = new AttributeData();
diff --git a/src/Types.d.ts b/src/Types.d.ts
index 095fdf352..7742b69c1 100644
--- a/src/Types.d.ts
+++ b/src/Types.d.ts
@@ -25,7 +25,6 @@ export interface IInputHandlingTerminal {
   options: ITerminalOptions;
   cols: number;
   rows: number;
-  applicationKeypad: boolean;
   insertMode: boolean;
   bracketedPasteMode: boolean;
   curAttrData: IAttributeData;
diff --git a/src/common/TestUtils.test.ts b/src/common/TestUtils.test.ts
index e556b371a..581477481 100644
--- a/src/common/TestUtils.test.ts
+++ b/src/common/TestUtils.test.ts
@@ -59,6 +59,7 @@ export class MockCoreService implements ICoreService {
   isFocused: boolean = false;
   decPrivateModes: IDecPrivateModes = {
     applicationCursorKeys: false,
+    applicationKeypad: false,
     origin: false,
     wraparound: true
   };
diff --git a/src/common/Types.d.ts b/src/common/Types.d.ts
index a3887e045..9b8a18b5a 100644
--- a/src/common/Types.d.ts
+++ b/src/common/Types.d.ts
@@ -152,6 +152,7 @@ export interface IMarker extends IDisposable {
 
 export interface IDecPrivateModes {
   applicationCursorKeys: boolean;
+  applicationKeypad: boolean;
   origin: boolean;
   wraparound: boolean; // defaults: xterm - true, vt100 - false
 }
diff --git a/src/common/services/CoreService.ts b/src/common/services/CoreService.ts
index 4a94b0bba..df9161e9c 100644
--- a/src/common/services/CoreService.ts
+++ b/src/common/services/CoreService.ts
@@ -10,6 +10,7 @@ import { clone } from 'common/Clone';
 
 const DEFAULT_DEC_PRIVATE_MODES: IDecPrivateModes = Object.freeze({
   applicationCursorKeys: false,
+  applicationKeypad: false,
   origin: false,
   wraparound: true // defaults: xterm - true, vt100 - false
 });