diff --git a/crates/sidebar/src/sidebar.rs b/crates/sidebar/src/sidebar.rs
index 081578ed9a8105a054095f369071f95c874c68ac..c1137f1845326d3bf1190568597b2480ac0d0bc5 100644
--- a/crates/sidebar/src/sidebar.rs
+++ b/crates/sidebar/src/sidebar.rs
@@ -1548,6 +1548,7 @@ mod tests {
         let sidebar =
             cx.update(|window, cx| cx.new(|cx| Sidebar::new(multi_workspace.clone(), window, cx)));
         multi_workspace.update_in(cx, |mw, window, cx| {
+            mw.set_singleton(false, window, cx);
             mw.register_sidebar(sidebar.clone(), window, cx);
         });
         cx.run_until_parked();