diff --git a/packages/ui-components/src/components/toolbar.tsx b/packages/ui-components/src/components/toolbar.tsx
index 964c897231b9..ff118e2dc29f 100644
--- a/packages/ui-components/src/components/toolbar.tsx
+++ b/packages/ui-components/src/components/toolbar.tsx
@@ -486,7 +486,7 @@ export class ReactiveToolbar extends Toolbar<Widget> {
       // Invokes resizing to ensure correct display of items after an addition, only
       // if the toolbar is rendered.
       if (this.isVisible) {
-        void this._onResize();
+        void this._resizer.invoke();
       }
     }
     return status;