diff --git a/Marlin/src/pins/ramps/pins_TRIGORILLA_14.h b/Marlin/src/pins/ramps/pins_TRIGORILLA_14.h
index 7c01c8aba8..9a1866c215 100644
--- a/Marlin/src/pins/ramps/pins_TRIGORILLA_14.h
+++ b/Marlin/src/pins/ramps/pins_TRIGORILLA_14.h
@@ -120,6 +120,7 @@
   #define Y_STOP_PIN                          42  // AUX (1)
   #define Z_STOP_PIN                          43  // AUX (2)
   #ifndef Z2_STOP_PIN
+    #define X_MAX_PIN                         18  // If X_MAX_PIN != Z2_STOP_PIN homing sensor trigger state is "Inverted".
     #define Z2_STOP_PIN                       18  // Z-
   #endif