diff --git a/codex-rs/tui/src/chatwidget.rs b/codex-rs/tui/src/chatwidget.rs
index 2c6a54f287..9e6306238e 100644
--- a/codex-rs/tui/src/chatwidget.rs
+++ b/codex-rs/tui/src/chatwidget.rs
@@ -6489,6 +6489,9 @@ impl ChatWidget {
         if feature == Feature::RealtimeConversation {
             self.sync_realtime_command_enabled();
             if !enabled {
+                if self.realtime_conversation_state != RealtimeConversationUiState::Stopped {
+                    self.submit_op(Op::RealtimeConversationClose);
+                }
                 if let Some(a) = self.realtime_audio_controller.take() {
                     RealtimeAudioController::shutdown(a)
                 }
diff --git a/codex-rs/tui/src/chatwidget/tests.rs b/codex-rs/tui/src/chatwidget/tests.rs
index 8b4c1631a1..614aa8f8b2 100644
--- a/codex-rs/tui/src/chatwidget/tests.rs
+++ b/codex-rs/tui/src/chatwidget/tests.rs
@@ -4507,6 +4507,32 @@ async fn slash_realtime_toggle_sends_start_then_close_ops() {
     assert_matches!(op_rx.try_recv(), Ok(Op::RealtimeConversationClose));
 }
 
+#[tokio::test]
+async fn disabling_realtime_feature_closes_active_session() {
+    let (mut chat, _rx, mut op_rx) = make_chatwidget_manual(None).await;
+    chat.set_feature_enabled(Feature::RealtimeConversation, true);
+
+    chat.dispatch_command(SlashCommand::Realtime);
+    assert_matches!(
+        op_rx.try_recv(),
+        Ok(Op::RealtimeConversationStart(
+            ConversationStartParams { .. }
+        ))
+    );
+    assert_eq!(
+        chat.realtime_conversation_state,
+        RealtimeConversationUiState::Working
+    );
+
+    chat.set_feature_enabled(Feature::RealtimeConversation, false);
+
+    assert_eq!(
+        chat.realtime_conversation_state,
+        RealtimeConversationUiState::Stopped
+    );
+    assert_matches!(op_rx.try_recv(), Ok(Op::RealtimeConversationClose));
+}
+
 #[tokio::test]
 async fn realtime_events_update_lifecycle_state() {
     let (mut chat, mut rx, mut op_rx) = make_chatwidget_manual(None).await;