diff --git a/buildroot/share/PlatformIO/variants/MARLIN_H723VG/variant_MARLIN_STM32H723VG.h b/buildroot/share/PlatformIO/variants/MARLIN_H723VG/variant_MARLIN_STM32H723VG.h
index 8b67905680..c3e5c78ec5 100644
--- a/buildroot/share/PlatformIO/variants/MARLIN_H723VG/variant_MARLIN_STM32H723VG.h
+++ b/buildroot/share/PlatformIO/variants/MARLIN_H723VG/variant_MARLIN_STM32H723VG.h
@@ -161,6 +161,7 @@
 #define NUM_DIGITAL_PINS        82
 #define NUM_DUALPAD_PINS        2
 #define NUM_ANALOG_INPUTS       16
+#define NUM_ANALOG_FIRST        PA0
 
 // On-board LED pin number
 #ifndef LED_BUILTIN
diff --git a/buildroot/share/PlatformIO/variants/MARLIN_H723ZE/variant_MARLIN_STM32H723ZE.h b/buildroot/share/PlatformIO/variants/MARLIN_H723ZE/variant_MARLIN_STM32H723ZE.h
index d443f5c1fd..1b518f01cf 100644
--- a/buildroot/share/PlatformIO/variants/MARLIN_H723ZE/variant_MARLIN_STM32H723ZE.h
+++ b/buildroot/share/PlatformIO/variants/MARLIN_H723ZE/variant_MARLIN_STM32H723ZE.h
@@ -200,6 +200,7 @@
 #define NUM_DIGITAL_PINS        114
 #define NUM_DUALPAD_PINS        2
 #define NUM_ANALOG_INPUTS       28
+#define NUM_ANALOG_FIRST        PA0
 
 // On-board LED pin number
 #ifndef LED_BUILTIN
diff --git a/buildroot/share/PlatformIO/variants/MARLIN_H743VI/variant_MARLIN_STM32H743VI.h b/buildroot/share/PlatformIO/variants/MARLIN_H743VI/variant_MARLIN_STM32H743VI.h
index c4635c4b1f..5c0492ac3a 100644
--- a/buildroot/share/PlatformIO/variants/MARLIN_H743VI/variant_MARLIN_STM32H743VI.h
+++ b/buildroot/share/PlatformIO/variants/MARLIN_H743VI/variant_MARLIN_STM32H743VI.h
@@ -160,6 +160,7 @@
 #define NUM_DIGITAL_PINS        82
 #define NUM_DUALPAD_PINS        2
 #define NUM_ANALOG_INPUTS       16
+#define NUM_ANALOG_FIRST        PA0
 
 // On-board LED pin number
 #ifndef LED_BUILTIN