diff --git a/libraries/AP_HAL_ChibiOS/hwdef/scripts/defaults_periph.h b/libraries/AP_HAL_ChibiOS/hwdef/scripts/defaults_periph.h
index 46e017f583..3a0a8c3723 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/scripts/defaults_periph.h
+++ b/libraries/AP_HAL_ChibiOS/hwdef/scripts/defaults_periph.h
@@ -122,6 +122,10 @@
 #define AP_BATTERY_ESC_ENABLED 0
 #endif
 
+#ifndef AP_BATTERY_WATT_MAX_ENABLED
+#define AP_BATTERY_WATT_MAX_ENABLED 0
+#endif
+
 // disable compass calibrations on periphs; cal is done on the autopilot
 #ifndef COMPASS_CAL_ENABLED
 #define COMPASS_CAL_ENABLED 0