diff --git a/src/headless/public/Terminal.test.ts b/src/headless/public/Terminal.test.ts
index 8beffc69..059b4a50 100644
--- a/src/headless/public/Terminal.test.ts
+++ b/src/headless/public/Terminal.test.ts
@@ -22,7 +22,7 @@ describe('Headless API Tests', function (): void {
 
   it('Proposed API check', async () => {
     term = new Terminal({ allowProposedApi: false });
-    throws(() => term.markers, (error: any) => error.message === 'You must set the allowProposedApi option to true to use proposed API');
+    throws(() => term.unicode, (error: any) => error.message === 'You must set the allowProposedApi option to true to use proposed API');
   });
 
   it('write', async () => {
diff --git a/test/playwright/Terminal.test.ts b/test/playwright/Terminal.test.ts
index f03d687d..acd89f73 100644
--- a/test/playwright/Terminal.test.ts
+++ b/test/playwright/Terminal.test.ts
@@ -25,7 +25,7 @@ test.describe('API Integration Tests', () => {
     await openTerminal(ctx, { allowProposedApi: false }, { loadUnicodeGraphemesAddon: false });
     await ctx.page.evaluate(`
       try {
-        window.term.markers;
+        window.term.unicode;
       } catch (e) {
         window.throwMessage = e.message;
       }