diff --git a/libraries/AP_HAL/board/px4.h b/libraries/AP_HAL/board/px4.h
index 7decb479baec3c36f8001439dba508556c56e6e7..21df865baa9fbd4e7cda7d95c93cd50a2e01a3ff 100644
--- a/libraries/AP_HAL/board/px4.h
+++ b/libraries/AP_HAL/board/px4.h
@@ -50,6 +50,7 @@
 
 #define HAL_INS_ICM20608_NAME "icm20608"
 #define HAL_INS_ICM20608_AM_NAME "icm20608-am"
+#define HAL_INS_ICM20608_EXT_NAME "icm20608_ext"
 
 #define HAL_COMPASS_HMC5843_NAME "hmc5843"