diff --git a/Marlin/pins.h b/Marlin/pins.h
index 472133c5b4..68aaf656fc 100644
--- a/Marlin/pins.h
+++ b/Marlin/pins.h
@@ -133,6 +133,9 @@
   #include "pins_MEGATRONICS_2.h"
 #elif MB(MEGATRONICS_3)
   #include "pins_MEGATRONICS_3.h"
+#elif MB(MEGATRONICS_31)
+  #define MEGATRONICS_31
+  #include "pins_MEGATRONICS_3.h" 
 #elif MB(OMCA_A)
   #include "pins_OMCA_A.h"
 #elif MB(OMCA)