diff --git a/Marlin/src/pins/pins_RAMPS.h b/Marlin/src/pins/pins_RAMPS.h
index f00ec6e1097e4a0d7c0b8fd533d05a4ebe646622..d5b603ea59f191dd895f64fd0d079e9cfb611386 100644
--- a/Marlin/src/pins/pins_RAMPS.h
+++ b/Marlin/src/pins/pins_RAMPS.h
@@ -155,8 +155,8 @@
   //#define X2_HARDWARE_SERIAL Serial1
   //#define Y_HARDWARE_SERIAL  Serial1
   //#define Y2_HARDWARE_SERIAL Serial1
-  #define Z_HARDWARE_SERIAL  Serial3
-  #define Z2_HARDWARE_SERIAL Serial1
+  //#define Z_HARDWARE_SERIAL  Serial3
+  //#define Z2_HARDWARE_SERIAL Serial1
   //#define E0_HARDWARE_SERIAL Serial1
   //#define E1_HARDWARE_SERIAL Serial1
   //#define E2_HARDWARE_SERIAL Serial1