diff --git a/test/ruby/test_integer.rb b/test/ruby/test_integer.rb
index 7997ba65f7..cfda9e5985 100644
--- a/test/ruby/test_integer.rb
+++ b/test/ruby/test_integer.rb
@@ -648,5 +648,6 @@ class TestInteger < Test::Unit::TestCase
     assert_nothing_raised(ArgumentError, "[ruby-core:14139]") {
       assert_equal(0377, Integer("0_3_7_7"))
     }
+    assert_raise(ArgumentError, "[ruby-core:14139]") {Integer("0__3_7_7")}
   end
 end