diff --git a/codex-rs/app-server/src/codex_message_processor.rs b/codex-rs/app-server/src/codex_message_processor.rs
index 2b2f888e5b..0674201350 100644
--- a/codex-rs/app-server/src/codex_message_processor.rs
+++ b/codex-rs/app-server/src/codex_message_processor.rs
@@ -5601,7 +5601,7 @@ impl CodexMessageProcessor {
     }
 
     async fn unload_thread_without_subscribers(
-        &mut self,
+        &self,
         thread_id: ThreadId,
         thread: Arc<CodexThread>,
     ) {