diff --git a/config.rb b/config.rb
index 4f6b35b..45acdce 100644
--- a/config.rb
+++ b/config.rb
@@ -98,7 +98,7 @@ end if ENV['ANALYTICS_ID']
 
 helpers do
   def themes
-    data.themes.sort_by { |theme| theme['name'] }.map do |theme|
+    data.themes.sort_by { |theme| theme['name'].downcase }.map do |theme|
         OpenStruct.new(theme.merge(
             slug: theme['name'].parameterize.underscore,
             digest: Digest::MD5.new.hexdigest(theme['colors'])