diff --git a/js/toolbar.ts b/js/toolbar.ts
index d80cd5b353..33bf19eb89 100644
--- a/js/toolbar.ts
+++ b/js/toolbar.ts
@@ -79,7 +79,7 @@ export class Toolbar extends LitWidget<
     render() {
         return html`
             <widget-container
-                .collapsted="${false}"
+                .collapsed="${false}"
                 .hideCloseButton=${true}
                 .noHeader="${true}">
                 <tab-panel