diff --git a/keyboards/helix/rev2/keymaps/led_test/config.h b/keyboards/helix/rev2/keymaps/led_test/config.h
index cf9c8e5e392..56d5f913451 100644
--- a/keyboards/helix/rev2/keymaps/led_test/config.h
+++ b/keyboards/helix/rev2/keymaps/led_test/config.h
@@ -22,7 +22,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define CONFIG_USER_H
 
 // if you need more program area, try uncomment follow line
-//#undef SERIAL_USE_MULTI_TRANSACTION
+#undef SERIAL_USE_MULTI_TRANSACTION
 
 // place overrides here