diff --git a/Marlin/src/inc/SanityCheck.h b/Marlin/src/inc/SanityCheck.h
index 89b3811905..10f4676aa9 100644
--- a/Marlin/src/inc/SanityCheck.h
+++ b/Marlin/src/inc/SanityCheck.h
@@ -405,6 +405,10 @@
   #error "MAX6675_SS is now MAX6675_SS_PIN. Please update your configuration and/or pins."
 #elif defined(MAX6675_SS2)
   #error "MAX6675_SS2 is now MAX6675_SS2_PIN. Please update your configuration and/or pins."
+#elif defined(MAX31865_SENSOR_OHMS)
+  #error "MAX31865_SENSOR_OHMS is now MAX31865_SENSOR_OHMS_0. Please update your configuration."
+#elif defined(MAX31865_CALIBRATION_OHMS)
+  #error "MAX31865_CALIBRATION_OHMS is now MAX31865_CALIBRATION_OHMS_0. Please update your configuration."
 #elif defined(SPINDLE_LASER_ENABLE)
   #error "SPINDLE_LASER_ENABLE is now SPINDLE_FEATURE or LASER_FEATURE. Please update your Configuration_adv.h."
 #elif defined(SPINDLE_LASER_ENABLE_PIN)
@@ -1816,8 +1820,7 @@ static_assert(hbm[Z_AXIS] >= 0, "HOMING_BUMP_MM.Z must be greater than or equal
 
 #if MAX6675_0_IS_MAX31865 && !(defined(MAX31865_SENSOR_OHMS_0) && defined(MAX31865_CALIBRATION_OHMS_0))
   #error "MAX31865_SENSOR_OHMS_0 and MAX31865_CALIBRATION_OHMS_0 must be set in Configuration.h if TEMP_SENSOR_0 is MAX31865."
-#endif
-#if MAX6675_1_IS_MAX31865 && !(defined(MAX31865_SENSOR_OHMS_1) && defined(MAX31865_CALIBRATION_OHMS_1))
+#elif MAX6675_1_IS_MAX31865 && !(defined(MAX31865_SENSOR_OHMS_1) && defined(MAX31865_CALIBRATION_OHMS_1))
   #error "MAX31865_SENSOR_OHMS_1 and MAX31865_CALIBRATION_OHMS_1 must be set in Configuration.h if TEMP_SENSOR_1 is MAX31865."
 #endif