diff --git a/src/browser/CoreBrowserTerminal.ts b/src/browser/CoreBrowserTerminal.ts
index a75bd5165..72f38c9d0 100644
--- a/src/browser/CoreBrowserTerminal.ts
+++ b/src/browser/CoreBrowserTerminal.ts
@@ -37,7 +37,7 @@ import { CharacterJoinerService } from 'browser/services/CharacterJoinerService'
 import { CoreBrowserService } from 'browser/services/CoreBrowserService';
 import { LinkProviderService } from 'browser/services/LinkProviderService';
 import { MouseCoordsService } from 'browser/services/MouseCoordsService';
-import { MouseService } from 'browser/services/MouseService';
+import { MouseEventCssClasses, MouseService } from 'browser/services/MouseService';
 import { RenderService } from 'browser/services/RenderService';
 import { SelectionService } from 'browser/services/SelectionService';
 import { ICharSizeService, ICharacterJoinerService, ICoreBrowserService, IKeyboardService, ILinkProviderService, IMouseCoordsService, IMouseService, IRenderService, ISelectionService, IThemeService } from 'browser/services/Services';
@@ -620,10 +620,10 @@ export class CoreBrowserTerminal extends CoreTerminal implements ITerminal {
     // apply mouse event classes set by escape codes before terminal was attached
     if (this.mouseStateService.areMouseEventsActive && !this.options.mouseEventsRequireAlt) {
       this._selectionService.disable();
-      this.element.classList.add('enable-mouse-events');
+      this.element.classList.add(MouseEventCssClasses.ENABLE_MOUSE_EVENTS);
     } else {
       this._selectionService.enable();
-      this.element.classList.remove('enable-mouse-events');
+      this.element.classList.remove(MouseEventCssClasses.ENABLE_MOUSE_EVENTS);
     }
 
     if (this.options.screenReaderMode) {
diff --git a/src/browser/services/MouseService.test.ts b/src/browser/services/MouseService.test.ts
index df3983572..d7aa7308f 100644
--- a/src/browser/services/MouseService.test.ts
+++ b/src/browser/services/MouseService.test.ts
@@ -3,7 +3,7 @@
  * @license MIT
  */
 import { assert } from 'chai';
-import { AltMouseCursorController, MouseService } from 'browser/services/MouseService';
+import { AltMouseCursorController, MouseEventCssClasses, MouseService } from 'browser/services/MouseService';
 import { MouseStateService } from 'common/services/MouseStateService';
 import { CoreMouseAction, CoreMouseButton } from 'common/Types';
 import { IBufferService, ICoreService, ILogService, IOptionsService } from 'common/services/Services';
@@ -279,15 +279,15 @@ describe('MouseService mouseEventsRequireAlt', () => {
     }, disposable => disposable, () => {});
 
     mouseStateService.activeProtocol = 'ANY';
-    assert.isTrue(element.classList.contains('enable-mouse-events'));
+    assert.isTrue(element.classList.contains(MouseEventCssClasses.ENABLE_MOUSE_EVENTS));
     assert.equal(selectionService.disableCount, 1);
 
     optionsService.options.mouseEventsRequireAlt = true;
-    assert.isFalse(element.classList.contains('enable-mouse-events'));
+    assert.isFalse(element.classList.contains(MouseEventCssClasses.ENABLE_MOUSE_EVENTS));
     assert.equal(selectionService.enableCount, 2);
 
     optionsService.options.mouseEventsRequireAlt = false;
-    assert.isTrue(element.classList.contains('enable-mouse-events'));
+    assert.isTrue(element.classList.contains(MouseEventCssClasses.ENABLE_MOUSE_EVENTS));
     assert.equal(selectionService.disableCount, 2);
   });
 
@@ -344,10 +344,10 @@ describe('MouseService mouseEventsRequireAlt', () => {
       getModifierState: (key: string) => key === 'Alt' && altHeld
     } as KeyboardEvent);
 
-    assert.isFalse(element.classList.contains('enable-mouse-events'));
+    assert.isFalse(element.classList.contains(MouseEventCssClasses.ENABLE_MOUSE_EVENTS));
     sync(true);
-    assert.isTrue(element.classList.contains('enable-mouse-events'));
+    assert.isTrue(element.classList.contains(MouseEventCssClasses.ENABLE_MOUSE_EVENTS));
     sync(false);
-    assert.isFalse(element.classList.contains('enable-mouse-events'));
+    assert.isFalse(element.classList.contains(MouseEventCssClasses.ENABLE_MOUSE_EVENTS));
   });
 });
diff --git a/src/browser/services/MouseService.ts b/src/browser/services/MouseService.ts
index 64fe75ffe..164b6de9d 100644
--- a/src/browser/services/MouseService.ts
+++ b/src/browser/services/MouseService.ts
@@ -13,6 +13,10 @@ import { Gesture, EventType as GestureEventType, IGestureEvent } from 'browser/s
 
 type RequestedMouseEvents = Record<'mouseup' | 'wheel' | 'mousedrag' | 'mousemove', EventListener | null>;
 
+export const enum MouseEventCssClasses {
+  ENABLE_MOUSE_EVENTS = 'enable-mouse-events'
+}
+
 interface IMouseBindContext {
   readonly target: IMouseServiceTarget;
   readonly focus: () => void;
@@ -384,11 +388,11 @@ export class MouseService implements IMouseService {
         this._altMouseCursor?.resetClass();
         this._selectionService.enable();
       } else {
-        element.classList.add('enable-mouse-events');
+        element.classList.add(MouseEventCssClasses.ENABLE_MOUSE_EVENTS);
         this._selectionService.disable();
       }
     } else {
-      element.classList.remove('enable-mouse-events');
+      element.classList.remove(MouseEventCssClasses.ENABLE_MOUSE_EVENTS);
       this._selectionService.enable();
     }
   }
@@ -577,7 +581,7 @@ export class MouseService implements IMouseService {
 }
 
 /**
- * Toggles `enable-mouse-events` on the terminal element while alt is held when
+ * Toggles MouseEventCssClasses.ENABLE_MOUSE_EVENTS on the terminal element while alt is held when
  * `mouseEventsRequireAlt` is active. DOM listeners are only registered while active.
  */
 export class AltMouseCursorController implements IDisposable {
@@ -630,9 +634,9 @@ export class AltMouseCursorController implements IDisposable {
 
   private _updateClass(altHeld: boolean): void {
     if (altHeld) {
-      this._element.classList.add('enable-mouse-events');
+      this._element.classList.add(MouseEventCssClasses.ENABLE_MOUSE_EVENTS);
     } else {
-      this._element.classList.remove('enable-mouse-events');
+      this._element.classList.remove(MouseEventCssClasses.ENABLE_MOUSE_EVENTS);
     }
   }
 }