diff --git a/codex-rs/core/src/exec.rs b/codex-rs/core/src/exec.rs
index aa01923ba7..e9ee9ea82a 100644
--- a/codex-rs/core/src/exec.rs
+++ b/codex-rs/core/src/exec.rs
@@ -86,9 +86,11 @@ pub struct StdoutStream {
     pub tx_event: Sender<Event>,
 }
 
+type DeltaEventFn = dyn Fn(&str, ExecOutputStream, Vec<u8>) -> EventMsg + Send + Sync;
+
 #[derive(Clone)]
 pub struct DeltaEventBuilder {
-    inner: Arc<dyn Fn(&str, ExecOutputStream, Vec<u8>) -> EventMsg + Send + Sync>,
+    inner: Arc<DeltaEventFn>,
 }
 
 impl DeltaEventBuilder {
diff --git a/codex-rs/tui/src/chatwidget.rs b/codex-rs/tui/src/chatwidget.rs
index f48ed26990..3901b057cd 100644
--- a/codex-rs/tui/src/chatwidget.rs
+++ b/codex-rs/tui/src/chatwidget.rs
@@ -981,7 +981,7 @@ impl ChatWidget {
             self.flush_active_cell();
 
             self.active_cell = Some(Box::new(new_active_exec_command(
-                call_id.clone(),
+                call_id,
                 command,
                 parsed_cmd,
                 is_user_shell_command,