diff --git a/app/models/enumeration.rb b/app/models/enumeration.rb
index 826955c..d532c78 100644
--- a/app/models/enumeration.rb
+++ b/app/models/enumeration.rb
@@ -98,7 +98,7 @@ class Enumeration < ActiveRecord::Base
   #
   # Note: subclasses is protected in ActiveRecord
   def self.get_subclasses
-    @@subclasses[Enumeration]
+    subclasses
   end
 
   # Does the +new+ Hash override the previous Enumeration?
diff --git a/test/unit/enumeration_test.rb b/test/unit/enumeration_test.rb
index 5c03dc2..56be566 100644
--- a/test/unit/enumeration_test.rb
+++ b/test/unit/enumeration_test.rb
@@ -108,4 +108,15 @@ class EnumerationTest < ActiveSupport::TestCase
     enumeration.parent = Enumeration.find(5)
     assert enumeration.is_override?
   end
+
+  def test_get_subclasses
+    classes = Enumeration.get_subclasses
+    assert_include IssuePriority, classes
+    assert_include DocumentCategory, classes
+    assert_include TimeEntryActivity, classes
+
+    classes.each do |klass|
+      assert_equal Enumeration, klass.superclass
+    end
+  end
 end