diff --git a/Marlin/src/pins/pins_RAMPS.h b/Marlin/src/pins/pins_RAMPS.h
index 86c7d8fbf3..2dbbca106a 100644
--- a/Marlin/src/pins/pins_RAMPS.h
+++ b/Marlin/src/pins/pins_RAMPS.h
@@ -257,7 +257,9 @@
 #endif
 
 // define digital pin 4 for the filament runout sensor. Use the RAMPS 1.4 digital input 4 on the servos connector
-#define FIL_RUNOUT_PIN      4
+#ifndef FIL_RUNOUT_PIN
+  #define FIL_RUNOUT_PIN    4
+#endif
 
 #ifndef PS_ON_PIN
   #define PS_ON_PIN        12