diff --git a/test/local_entry_test.rb b/test/local_entry_test.rb
index 989fa977..cba362e6 100644
--- a/test/local_entry_test.rb
+++ b/test/local_entry_test.rb
@@ -79,7 +79,7 @@ def test_rewriteLocalHeader64
     entry.size = 0x123456789ABCDEF0
     entry.compressed_size = 0x0123456789ABCDEF
     entry.write_local_entry(buf2, true)
-    entry.extra['Zip64'].wont_be_nil
+    refute_nil(entry.extra['Zip64'])
     refute_equal(buf1.size, 0)
     assert_equal(buf1.size, buf2.size) # it can't grow, or we'd clobber file data
   end