diff --git a/app/controllers/themes_controller.rb b/app/controllers/themes_controller.rb
index 7973b47..1904002 100644
--- a/app/controllers/themes_controller.rb
+++ b/app/controllers/themes_controller.rb
@@ -13,7 +13,7 @@ class ThemesController < ApplicationController
 
   def index
     @environment = environment
-    @themes = (environment.themes + Theme.approved_themes(target)).sort_by { |t| t.name }
+    @themes = (environment.themes + Theme.approved_themes(target)).uniq.sort_by { |t| t.name }
 
     @current_theme = target.theme
 
--
libgit2 0.21.2