diff --git a/app/helpers/application_helper/toolbar_builder.rb b/app/helpers/application_helper/toolbar_builder.rb
index d543e347b6d..4957eaf7ca6 100644
--- a/app/helpers/application_helper/toolbar_builder.rb
+++ b/app/helpers/application_helper/toolbar_builder.rb
@@ -413,7 +413,7 @@ def build_toolbar_hide_button_ops(id)
       when "diagnostics_summary"
         return !["refresh_server_summary", "restart_server"].include?(id)
       when "diagnostics_workers"
-        return !["restart_workers", "refresh_workers"].include?(id)
+        return !%w(restart_workers refresh_workers).include?(id)
       else
         return true
       end
diff --git a/spec/helpers/application_helper/buttons/refresh_workers_spec.rb b/spec/helpers/application_helper/buttons/refresh_workers_spec.rb
index 5a5148824cf..b6b3f8fdfaa 100644
--- a/spec/helpers/application_helper/buttons/refresh_workers_spec.rb
+++ b/spec/helpers/application_helper/buttons/refresh_workers_spec.rb
@@ -9,7 +9,7 @@
     it 'should be visible when active_tab == diagnostics_workers in :diagnostics_tree' do
       view_context = setup_view_context_with_sandbox({})
       button = described_class.new(view_context, {}, {'record' => @record}, {})
-      button.instance_variable_set(:@sb, {:active_tab => 'diagnostics_workers'})
+      button.instance_variable_set(:@sb, :active_tab => 'diagnostics_workers')
       expect(button.visible?).to be_truthy
     end