diff --git a/Marlin/src/pins/stm32f4/pins_MKS_ROBIN_NANO_V3.h b/Marlin/src/pins/stm32f4/pins_MKS_ROBIN_NANO_V3.h
index 7de5552dbb..ac93580589 100644
--- a/Marlin/src/pins/stm32f4/pins_MKS_ROBIN_NANO_V3.h
+++ b/Marlin/src/pins/stm32f4/pins_MKS_ROBIN_NANO_V3.h
@@ -59,7 +59,7 @@
 //
 // Limit Switches
 //
-#define X_DIAG_PIN                          PD15
+#define X_DIAG_PIN                          PA15
 #define Y_DIAG_PIN                          PD2
 #define Z_DIAG_PIN                          PC8
 #define E0_DIAG_PIN                         PC4