diff --git a/libraries/AP_HAL_ChibiOS/hwdef/MatekF405-STD/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/MatekF405-STD/hwdef.dat
index 0467d928ca..05ecc0d7e2 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/MatekF405-STD/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/MatekF405-STD/hwdef.dat
@@ -2,5 +2,5 @@
 
 include ../MatekF405/hwdef.dat
 
-undefine HAL_INS_DEFAULT_ROTATION ROTATION_YAW_180
+undef HAL_INS_DEFAULT_ROTATION ROTATION_YAW_180
 define HAL_INS_DEFAULT_ROTATION ROTATION_YAW_90