diff --git a/libraries/AP_HAL_ChibiOS/hwdef/include/minimize_features.inc b/libraries/AP_HAL_ChibiOS/hwdef/include/minimize_features.inc
index 9568a82e7a..1fdde4222e 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/include/minimize_features.inc
+++ b/libraries/AP_HAL_ChibiOS/hwdef/include/minimize_features.inc
@@ -17,3 +17,6 @@ define HAL_RUNCAM_ENABLED 0
 
 # minimized boards don't get configuration via SmartAudio by default:
 define AP_SMARTAUDIO_ENABLED 0
+
+# can't fit Turtle mode on minimized boards:
+define MODE_TURTLE_ENABLED 1