diff --git a/app/models/environment.rb b/app/models/environment.rb
index 4cf1199..d2a6643 100644
--- a/app/models/environment.rb
+++ b/app/models/environment.rb
@@ -23,7 +23,7 @@ class Environment < ActiveRecord::Base
   has_many :profiles
 
   has_many :categories
-  has_many :display_categories, :class_name => 'Category', :conditions => 'display_color is not null ', :order => 'display_color'
+  has_many :display_categories, :class_name => 'Category', :conditions => 'display_color is not null and parent_id is null', :order => 'display_color'
 
   # #################################################
   # Attributes
diff --git a/test/unit/environment_test.rb b/test/unit/environment_test.rb
index 42cc631..8933987 100644
--- a/test/unit/environment_test.rb
+++ b/test/unit/environment_test.rb
@@ -128,6 +128,10 @@ class EnvironmentTest < Test::Unit::TestCase
     cat1 = env.categories.create(:name => 'category one', :display_color => 1)
     assert ! cat1.new_record?
 
+    # subcategories should be ignored
+    subcat1 = env.categories.create(:name => 'subcategory one', :parent_id => cat1.id)
+    assert ! subcat1.new_record?
+
     cat2 = env.categories.create(:name => 'category two')
     assert !cat2.new_record?
 
--
libgit2 0.21.2