diff --git a/Marlin/src/pins/ramps/pins_RAMPS.h b/Marlin/src/pins/ramps/pins_RAMPS.h
index 984a366b40..c13e8b522d 100644
--- a/Marlin/src/pins/ramps/pins_RAMPS.h
+++ b/Marlin/src/pins/ramps/pins_RAMPS.h
@@ -280,6 +280,13 @@
   #endif
 #endif
 
+
+#if ANY(KNUTWURST_CHIRON, KNUTWURST_4MAXP2)
+  #define FIL_RUNOUT_PIN 33
+#else
+  #define FIL_RUNOUT_PIN 19
+#endif
+
 #ifndef PS_ON_PIN
   #define PS_ON_PIN                           12
 #endif