diff --git a/Marlin/src/pins/ramps/pins_MKS_GEN_13.h b/Marlin/src/pins/ramps/pins_MKS_GEN_13.h
index 7a8c99e3af1..1e354a10dcf 100644
--- a/Marlin/src/pins/ramps/pins_MKS_GEN_13.h
+++ b/Marlin/src/pins/ramps/pins_MKS_GEN_13.h
@@ -40,7 +40,9 @@
 // Heaters / Fans
 //
 // Power outputs EFBF or EFBE
-#define MOSFET_D_PIN                           7
+//
+#define MOSFET_B_PIN                           7
+#define FAN_PIN                                9
 
 //
 // PSU / SERVO