diff --git a/libraries/AP_HAL/AP_HAL_Boards.h b/libraries/AP_HAL/AP_HAL_Boards.h
index 021f3ca284..076ce1abda 100644
--- a/libraries/AP_HAL/AP_HAL_Boards.h
+++ b/libraries/AP_HAL/AP_HAL_Boards.h
@@ -263,10 +263,6 @@
 #define HAL_ENABLE_THREAD_STATISTICS 0
 #endif
 
-#ifndef AP_INERTIALSENSOR_ENABLED
-#define AP_INERTIALSENSOR_ENABLED (!defined(HAL_BUILD_AP_PERIPH))
-#endif
-
 #ifndef AP_STATS_ENABLED
 #define AP_STATS_ENABLED (!defined(HAL_BUILD_AP_PERIPH))
 #endif