diff --git a/test/zlib/test_zlib.rb b/test/zlib/test_zlib.rb
index c464bb214f..6a90c6782c 100644
--- a/test/zlib/test_zlib.rb
+++ b/test/zlib/test_zlib.rb
@@ -621,9 +621,9 @@ if defined? Zlib
         gz.close
 
         sio = StringIO.new(s)
-        Zlib::GzipReader.new(sio) do |f|
-          assert_raise(NoMethodError) { f.path }
-        end
+        gz = Zlib::GzipReader.new(sio)
+        assert_raise(NoMethodError) { gz.path }
+        gz.close
       }
     end
   end