diff --git a/Marlin/Configuration.h b/Marlin/Configuration.h
index 7749255457..12e46d92ce 100644
--- a/Marlin/Configuration.h
+++ b/Marlin/Configuration.h
@@ -128,8 +128,8 @@
  * Currently Ethernet (-2) is only supported on Teensy 4.1 boards.
  * :[-2, -1, 0, 1, 2, 3, 4, 5, 6, 7]
  */
-//#define SERIAL_PORT_2 -1
-//#define BAUDRATE_2 250000   // Enable to override BAUDRATE
+#define SERIAL_PORT_2 -1
+#define BAUDRATE_2 250000   // Enable to override BAUDRATE
 
 /**
  * Select a third serial port on the board to use for communication with the host.