diff --git a/Marlin/src/pins/ramps/pins_COPYMASTER_3D.h b/Marlin/src/pins/ramps/pins_COPYMASTER_3D.h
index 7ee66b1194..8f61ef47dc 100644
--- a/Marlin/src/pins/ramps/pins_COPYMASTER_3D.h
+++ b/Marlin/src/pins/ramps/pins_COPYMASTER_3D.h
@@ -24,6 +24,7 @@
 #define BOARD_INFO_NAME "Copymaster 3D RAMPS"
 
 #define Z_STEP_PIN        47
+#define Y_MAX_PIN         14
 #define FIL_RUNOUT_PIN    15
 #define SD_DETECT_PIN     66