diff --git a/crates/agent_ui/src/acp/thread_history.rs b/crates/agent_ui/src/acp/thread_history.rs
index d96c3b3219717b3ffa7310d207a323bc5fb222b0..9cfe30278e1e46d95c00b3c881358a4b00786801 100644
--- a/crates/agent_ui/src/acp/thread_history.rs
+++ b/crates/agent_ui/src/acp/thread_history.rs
@@ -450,6 +450,7 @@ impl Render for AcpThreadHistory {
         v_flex()
             .key_context("ThreadHistory")
             .size_full()
+            .bg(cx.theme().colors().panel_background)
             .on_action(cx.listener(Self::select_previous))
             .on_action(cx.listener(Self::select_next))
             .on_action(cx.listener(Self::select_first))