diff --git a/src/agents/bash-tools.exec.background-abort.e2e.test.ts b/src/agents/bash-tools.exec.background-abort.e2e.test.ts
index 949999de243..89f6c261474 100644
--- a/src/agents/bash-tools.exec.background-abort.e2e.test.ts
+++ b/src/agents/bash-tools.exec.background-abort.e2e.test.ts
@@ -43,6 +43,37 @@ test("background exec is not killed when tool signal aborts", async () => {
   }
 });
 
+test("pty background exec is not killed when tool signal aborts", async () => {
+  const tool = createExecTool({ allowBackground: true, backgroundMs: 0 });
+  const abortController = new AbortController();
+
+  const result = await tool.execute(
+    "toolcall",
+    { command: 'node -e "setTimeout(() => {}, 5000)"', background: true, pty: true },
+    abortController.signal,
+  );
+
+  expect(result.details.status).toBe("running");
+  const sessionId = (result.details as { sessionId: string }).sessionId;
+
+  abortController.abort();
+
+  await sleep(150);
+
+  const running = getSession(sessionId);
+  const finished = getFinishedSession(sessionId);
+
+  try {
+    expect(finished).toBeUndefined();
+    expect(running?.exited).toBe(false);
+  } finally {
+    const pid = running?.pid;
+    if (pid) {
+      killProcessTree(pid);
+    }
+  }
+});
+
 test("background exec still times out after tool signal abort", async () => {
   const tool = createExecTool({ allowBackground: true, backgroundMs: 0 });
   const abortController = new AbortController();