diff --git a/test/net/imap/test_data_lite.rb b/test/net/imap/test_data_lite.rb
index 42681a0e..aa1e312a 100644
--- a/test/net/imap/test_data_lite.rb
+++ b/test/net/imap/test_data_lite.rb
@@ -289,7 +289,7 @@ def test_memberless
         assert_equal(klass.new, test)
         refute_equal(Data.define.new, test)
 
-        assert_equal('#<data >', test.inspect)
+        assert_match(/#<data ?>/, test.inspect)
         assert_equal([], test.members)
         assert_equal({}, test.to_h)
       end