1 files changed, 2 insertions, 1 deletions
diff --git a/test/ruby/test_env.rb b/test/ruby/test_env.rb
index 28f0e87b59..0ee702b222 100644
--- a/test/ruby/test_env.rb
+++ b/test/ruby/test_env.rb
@@ -118,7 +118,8 @@ class TestEnv < Test::Unit::TestCase
         ENV["test"] = "foo"
       end.join
     end
-    assert_raise(TypeError) { ENV["test"] = nil }
+    assert_nothing_raised { ENV["test"] = nil }
+    assert_equal(nil, ENV["test"])
     assert_raise(ArgumentError) { ENV["foo\0bar"] = "test" }
     assert_raise(ArgumentError) { ENV["test"] = "foo\0bar" }
     ENV[PATH_ENV] = "/tmp/".taint