diff --git a/codex-rs/tui/src/lib.rs b/codex-rs/tui/src/lib.rs
index d9793a07a..71a47d119 100644
--- a/codex-rs/tui/src/lib.rs
+++ b/codex-rs/tui/src/lib.rs
@@ -269,6 +269,7 @@ pub async fn run_main(
     let file_layer = tracing_subscriber::fmt::layer()
         .with_writer(non_blocking)
         .with_target(false)
+        .with_ansi(false)
         .with_span_events(tracing_subscriber::fmt::format::FmtSpan::CLOSE)
         .with_filter(env_filter());