diff --git a/codex-rs/exec-server/src/fs_sandbox.rs b/codex-rs/exec-server/src/fs_sandbox.rs
index 3356791d4..111d15317 100644
--- a/codex-rs/exec-server/src/fs_sandbox.rs
+++ b/codex-rs/exec-server/src/fs_sandbox.rs
@@ -298,6 +298,7 @@ fn spawn_command(
     command.stdin(std::process::Stdio::piped());
     command.stdout(std::process::Stdio::piped());
     command.stderr(std::process::Stdio::piped());
+    command.kill_on_drop(true);
     command.spawn().map_err(io_error)
 }