diff --git a/libraries/AP_HAL_ChibiOS/hwdef/VRBrain-v51/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/VRBrain-v51/hwdef.dat
index 1d640a0cd5..c85036ac8c 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/VRBrain-v51/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/VRBrain-v51/hwdef.dat
@@ -169,3 +169,7 @@ define STM32_PWM_USE_ADVANCED TRUE
 # 12 PWM available by default
 define BOARD_PWM_COUNT_DEFAULT 14
 
+# save some flash
+define GENERATOR_ENABLED 0
+define AC_OAPATHPLANNER_ENABLED 0
+define PRECISION_LANDING 0