diff --git a/crates/ui-egui/src/grid.rs b/crates/ui-egui/src/grid.rs
index f5844f006..b84839e67 100644
--- a/crates/ui-egui/src/grid.rs
+++ b/crates/ui-egui/src/grid.rs
@@ -784,6 +784,9 @@ pub fn show(app: &mut SheetApp, ui: &mut egui::Ui) {
     context_menu(app, ui);
     object_menu(app, ui);
     let track_x = if rtl { (available.left(), rect.left()) } else { (rect.right(), available.right()) };
+    // The track starts below the column headings and frozen rows; the bar's column beside them
+    // takes its colour too instead of showing a light square in dark mode.
+    ui.painter().rect_filled(Rect::from_min_max(pos2(track_x.0, rect.top()), pos2(track_x.1, rect.bottom())), 0.0, t.tab_bar);
     vertical_scrollbar(app, ui, sh, &geo, track_x, max_y, &t);
     if app.session.clipboard.is_some() {
         // By the clock, not per frame: a gliding outline repaints more often than the ants step.