diff --git a/test/ruby/test_refinement.rb b/test/ruby/test_refinement.rb
index ba571670cf..49bf907302 100644
--- a/test/ruby/test_refinement.rb
+++ b/test/ruby/test_refinement.rb
@@ -235,6 +235,7 @@ class TestRefinement < Test::Unit::TestCase
       meth.call(3)
     EOS
     assert_equal(:refine_pow, eval_using(MethodIntegerPowEx, "2.pow(3)"))
+    assert_equal(:refine_pow, eval_using(MethodIntegerPowEx, "2.:pow.(3)"))
   end
 
   module InstanceMethodIntegerPowEx