diff --git a/spec/helpers/theme_helper_spec.rb b/spec/helpers/theme_helper_spec.rb
index 337536878..60275adf5 100644
--- a/spec/helpers/theme_helper_spec.rb
+++ b/spec/helpers/theme_helper_spec.rb
@@ -6,10 +6,10 @@ RSpec.describe ThemeHelper do
   describe 'theme_style_tags' do
     let(:result) { helper.theme_style_tags(theme) }
 
-    context 'when using system theme' do
+    context 'when using "system" theme' do
       let(:theme) { 'system' }
 
-      it 'returns the mastodon-light and default stylesheets with correct color schemes' do
+      it 'returns the mastodon-light and application stylesheets with correct color schemes' do
         expect(html_links.first.attributes.symbolize_keys)
           .to include(
             href: have_attributes(value: match(/mastodon-light/)),
@@ -23,6 +23,17 @@ RSpec.describe ThemeHelper do
       end
     end
 
+    context 'when using "default" theme' do
+      let(:theme) { 'default' }
+
+      it 'returns the application stylesheet' do
+        expect(html_links.last.attributes.symbolize_keys)
+          .to include(
+            href: have_attributes(value: match(/application/))
+          )
+      end
+    end
+
     context 'when using other theme' do
       let(:theme) { 'contrast' }