diff --git a/UICatalog/UICatalog/Controllers/Toolbars/CustomToolbarViewController.cs b/UICatalog/UICatalog/Controllers/Toolbars/CustomToolbarViewController.cs
index 7a0c3dbcc..e00591e3f 100644
--- a/UICatalog/UICatalog/Controllers/Toolbars/CustomToolbarViewController.cs
+++ b/UICatalog/UICatalog/Controllers/Toolbars/CustomToolbarViewController.cs
@@ -29,7 +29,7 @@ private void ConfigureToolbar()
             var toolbarButtonItems = new[]
             {
                 leftButton,
-                new UIBarButtonItem(UIBarButtonSystemItem.FlexibleSpace, null),
+                new UIBarButtonItem(UIBarButtonSystemItem.FlexibleSpace, (EventHandler) null),
                 rightButton
             };
             toolbar.SetItems(toolbarButtonItems, true);