diff --git a/packages/protocol/src/terminal-input-mode.test.ts b/packages/protocol/src/terminal-input-mode.test.ts
index 39273c767..f17b6b7e7 100644
--- a/packages/protocol/src/terminal-input-mode.test.ts
+++ b/packages/protocol/src/terminal-input-mode.test.ts
@@ -106,6 +106,7 @@ describe("TerminalInputModeTracker", () => {
       applicationCursorKeys: false,
       bracketedPaste: true,
     });
+    expect(tracker.getPreamble()).toBe("\x1b[?2004h");
 
     expect(tracker.feed("\x1b[?2004l").changed).toBe(true);
     expect(tracker.getState()).toEqual({
@@ -114,6 +115,7 @@ describe("TerminalInputModeTracker", () => {
       applicationCursorKeys: false,
       bracketedPaste: false,
     });
+    expect(tracker.getPreamble()).toBe("");
   });
 
   it("ignores encoded key input sequences", () => {
diff --git a/packages/protocol/src/terminal-input-mode.ts b/packages/protocol/src/terminal-input-mode.ts
index a7dc09c80..f35156eb5 100644
--- a/packages/protocol/src/terminal-input-mode.ts
+++ b/packages/protocol/src/terminal-input-mode.ts
@@ -156,6 +156,9 @@ export class TerminalInputModeTracker {
     if (this.applicationCursorKeys) {
       parts.push("\x1b[?1h");
     }
+    if (this.bracketedPaste) {
+      parts.push("\x1b[?2004h");
+    }
     return parts.join("");
   }