diff --git a/test/ruby/test_enum.rb b/test/ruby/test_enum.rb
index 077be1767f..a805ee6e55 100644
--- a/test/ruby/test_enum.rb
+++ b/test/ruby/test_enum.rb
@@ -35,6 +35,15 @@ class TestEnumerable < Test::Unit::TestCase
     assert_equal(3, @obj.count {|x| x % 2 == 1 })
     assert_equal(2, @obj.count(1) {|x| x % 2 == 1 })
     assert_raise(ArgumentError) { @obj.count(0, 1) }
+
+    en = Class.new {
+      include Enumerable
+      alias :size :count
+      def each
+        yield 1
+      end
+    }
+    assert_equal(1, en.new.count, '[ruby-core:24794]')
   end
 
   def test_find