diff --git a/Marlin/pins_RAMPS.h b/Marlin/pins_RAMPS.h
index c73c0c631..0e6f8bced 100644
--- a/Marlin/pins_RAMPS.h
+++ b/Marlin/pins_RAMPS.h
@@ -252,7 +252,9 @@
 #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