diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index 62c0e78d23..b0114132cc 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -243,6 +243,10 @@ module ApplicationHelper
     javascript_pack_tag("flavours/#{current_flavour}/#{pack_name}", **options)
   end
 
+  def flavoured_stylesheet_pack_tag(pack_name, **options)
+    stylesheet_pack_tag("flavours/#{current_flavour}/#{pack_name}", **options)
+  end
+
   def preload_signed_in_js_packs
     preload_files = Themes.instance.flavour(current_flavour)&.fetch('signed_in_preload', nil) || []
     safe_join(preload_files.map { |entry| preload_pack_asset entry })
diff --git a/app/views/layouts/application.html.haml b/app/views/layouts/application.html.haml
index 4fe314eb4b..7d69ea88e6 100755
--- a/app/views/layouts/application.html.haml
+++ b/app/views/layouts/application.html.haml
@@ -26,11 +26,11 @@
 
     %title= html_title
 
-    = stylesheet_pack_tag 'flavours/vanilla/common', media: 'all', crossorigin: 'anonymous' # upstream uses `common` but that's implicitly defined
+    = flavoured_stylesheet_pack_tag 'common', media: 'all', crossorigin: 'anonymous' # upstream uses `common` but that's implicitly defined
     = stylesheet_pack_tag current_theme, media: 'all', crossorigin: 'anonymous'
 
     -# Needed for the wicg-inert polyfill. It needs to be on it's own <style> tag, with this `id`
-    = stylesheet_pack_tag 'flavours/vanilla/inert', media: 'all', id: 'inert-style'
+    = flavoured_stylesheet_pack_tag 'inert', media: 'all', id: 'inert-style'
 
     = javascript_pack_tag 'common', crossorigin: 'anonymous'
     = preload_locale_pack
diff --git a/app/views/layouts/embedded.html.haml b/app/views/layouts/embedded.html.haml
index e8764567d1..b8b0c8683b 100644
--- a/app/views/layouts/embedded.html.haml
+++ b/app/views/layouts/embedded.html.haml
@@ -11,7 +11,7 @@
     - if storage_host?
       %link{ rel: 'dns-prefetch', href: storage_host }/
 
-    = stylesheet_pack_tag 'flavours/vanilla/common', media: 'all', crossorigin: 'anonymous' # upstream uses `common` but that's implicitly defined
+    = flavoured_stylesheet_pack_tag 'common', media: 'all', crossorigin: 'anonymous' # upstream uses `common` but that's implicitly defined
     = stylesheet_pack_tag current_theme, media: 'all', crossorigin: 'anonymous'
     = javascript_pack_tag 'common', integrity: true, crossorigin: 'anonymous'
     = preload_locale_pack
diff --git a/app/views/layouts/error.html.haml b/app/views/layouts/error.html.haml
index 7ad2ad3d69..b5f9292bba 100644
--- a/app/views/layouts/error.html.haml
+++ b/app/views/layouts/error.html.haml
@@ -5,7 +5,7 @@
     %meta{ charset: 'utf-8' }/
     %title= safe_join([yield(:page_title), Setting.default_settings['site_title']], ' - ')
     %meta{ content: 'width=device-width,initial-scale=1', name: 'viewport' }/
-    = stylesheet_pack_tag 'flavours/vanilla/common', media: 'all', crossorigin: 'anonymous' # upstream uses `common` but that's implicitly defined
+    = flavoured_stylesheet_pack_tag 'common', media: 'all', crossorigin: 'anonymous' # upstream uses `common` but that's implicitly defined
     = stylesheet_pack_tag current_theme, media: 'all', crossorigin: 'anonymous'
     = javascript_pack_tag 'common', crossorigin: 'anonymous'
     = flavoured_javascript_pack_tag 'error', crossorigin: 'anonymous'
diff --git a/app/views/layouts/mailer.html.haml b/app/views/layouts/mailer.html.haml
index 76f9b827a0..f632b4d111 100644
--- a/app/views/layouts/mailer.html.haml
+++ b/app/views/layouts/mailer.html.haml
@@ -18,7 +18,7 @@
       <o:PixelsPerInch>96</o:PixelsPerInch>
       </o:OfficeDocumentSettings>
       </xml>
-    = stylesheet_pack_tag 'flavours/vanilla/mailer'
+    = stylesheet_pack_tag "flavours/#{Setting.default_settings['flavour'] || 'glitch'}/mailer"
   %body
     .email{ dir: locale_direction }
       %table.email-w-full{ cellspacing: 0, cellpadding: 0, border: 0, role: 'presentation' }