diff --git a/src/web/public/keyboard-accessory.js b/src/web/public/keyboard-accessory.js
index 8a629dfe..3c7263b2 100644
--- a/src/web/public/keyboard-accessory.js
+++ b/src/web/public/keyboard-accessory.js
@@ -1193,7 +1193,7 @@ const KeyboardAccessoryBar = {
     // Match xterm's prepareTextForTerminal(): CR keeps embedded newlines inside
     // the single-line input transport and is what terminal.paste() emitted.
     const pasteText = text.replace(/\r?\n/g, '\r');
-    app._sendInputAsync(sessionId, `\x1b[200~${pasteText}\x1b[201~`, { useMux: true });
+    app._sendInputAsync(sessionId, `\x1b[200~${pasteText}\x1b[201~`);
     setTimeout(() => app._sendInputAsync(sessionId, '\r', { useMux: true }), 120);
     return true;
   },
diff --git a/test/mobile-prompt-composer.test.ts b/test/mobile-prompt-composer.test.ts
index 5b16d120..45cf8cd4 100644
--- a/test/mobile-prompt-composer.test.ts
+++ b/test/mobile-prompt-composer.test.ts
@@ -217,9 +217,7 @@ describe('mobile prompt composer', () => {
 
     expect(app.terminal.paste).not.toHaveBeenCalled();
     expect(app._sendInputAsync).toHaveBeenCalledOnce();
-    expect(app._sendInputAsync).toHaveBeenNthCalledWith(1, 'session-1', '\x1b[200~first line\rsecond line\x1b[201~', {
-      useMux: true,
-    });
+    expect(app._sendInputAsync).toHaveBeenNthCalledWith(1, 'session-1', '\x1b[200~first line\rsecond line\x1b[201~');
     expect(composeButton.classList.contains('has-draft')).toBe(false);
     expect(timers).toContainEqual(expect.objectContaining({ delay: 120 }));
     runTimers();
@@ -240,9 +238,7 @@ describe('mobile prompt composer', () => {
     (document.querySelector('.paste-send') as HTMLButtonElement).click();
 
     expect(app.terminal.paste).not.toHaveBeenCalled();
-    expect(app._sendInputAsync).toHaveBeenCalledWith('session-1', '\x1b[200~still\rmultiline\x1b[201~', {
-      useMux: true,
-    });
+    expect(app._sendInputAsync).toHaveBeenCalledWith('session-1', '\x1b[200~still\rmultiline\x1b[201~');
     expect(document.querySelector('.prompt-composer-overlay')).toBeNull();
     expect(app.showToast).not.toHaveBeenCalled();
     runTimers();