diff --git a/codex-rs/tui/src/tui.rs b/codex-rs/tui/src/tui.rs
index f2c0f2afee..16faf4576f 100644
--- a/codex-rs/tui/src/tui.rs
+++ b/codex-rs/tui/src/tui.rs
@@ -3,7 +3,6 @@ use std::future::Future;
 use std::io::IsTerminal;
 use std::io::Result;
 use std::io::Stdout;
-use std::io::Write;
 use std::io::stdin;
 use std::io::stdout;
 use std::panic;
@@ -76,15 +75,8 @@ fn should_emit_notification(condition: NotificationCondition, terminal_focused:
 
 #[cfg(test)]
 mod tests {
-    use std::io::Write as _;
-
-    use super::clear_for_viewport_change;
     use super::should_emit_notification;
-    use crate::custom_terminal::Terminal as CustomTerminal;
-    use crate::test_backend::VT100Backend;
     use codex_config::types::NotificationCondition;
-    use ratatui::layout::Position;
-    use ratatui::layout::Rect;
 
     #[test]
     fn unfocused_notification_condition_is_suppressed_when_focused() {
@@ -109,47 +101,6 @@ mod tests {
             /*terminal_focused*/ false
         ));
     }
-
-    #[test]
-    fn first_viewport_change_clears_from_new_viewport_when_old_viewport_is_empty() {
-        let width = 12;
-        let height = 4;
-        let backend = VT100Backend::new(width, height);
-        let mut terminal =
-            CustomTerminal::with_options_and_cursor_position(backend, Position { x: 0, y: 1 })
-                .expect("terminal");
-        write!(
-            terminal.backend_mut(),
-            "shell line\r\nstale cells\r\nmore stale"
-        )
-        .expect("prefill terminal");
-
-        clear_for_viewport_change(
-            &mut terminal,
-            Rect::new(
-                /*x*/ 0,
-                /*y*/ 1,
-                /*width*/ width,
-                /*height*/ height - 1,
-            ),
-        )
-        .expect("clear transition");
-
-        let rows: Vec<String> = terminal
-            .backend()
-            .vt100()
-            .screen()
-            .rows(/*start*/ 0, width)
-            .collect();
-        assert!(
-            rows[0].contains("shell line"),
-            "expected content before the viewport to remain visible, rows: {rows:?}"
-        );
-        assert!(
-            !rows.iter().skip(1).any(|row| row.contains("stale")),
-            "expected stale cells inside the new viewport to be cleared, rows: {rows:?}"
-        );
-    }
 }
 
 pub fn set_modes() -> Result<()> {
@@ -438,18 +389,6 @@ struct PendingHistoryLines {
     wrap_policy: HistoryLineWrapPolicy,
 }
 
-fn clear_for_viewport_change<B>(terminal: &mut CustomTerminal<B>, new_area: Rect) -> Result<()>
-where
-    B: Backend + Write,
-{
-    let clear_position = if terminal.viewport_area.is_empty() {
-        new_area.as_position()
-    } else {
-        terminal.viewport_area.as_position()
-    };
-    terminal.clear_after_position(clear_position)
-}
-
 impl Tui {
     pub fn new(terminal: Terminal) -> Self {
         let (draw_tx, _) = broadcast::channel(1);