diff --git a/Marlin/src/pins/mega/pins_GT2560_V3.h b/Marlin/src/pins/mega/pins_GT2560_V3.h
index 8490d5571..46b4ebf42 100644
--- a/Marlin/src/pins/mega/pins_GT2560_V3.h
+++ b/Marlin/src/pins/mega/pins_GT2560_V3.h
@@ -83,6 +83,9 @@
 #ifndef FIL_RUNOUT2_PIN
   #define FIL_RUNOUT2_PIN                     67
 #endif
+#ifndef FIL_RUNOUT3_PIN
+  #define FIL_RUNOUT3_PIN                     54
+#endif
 
 //
 // Power Recovery