diff --git a/libraries/AP_ExternalAHRS/AP_ExternalAHRS_config.h b/libraries/AP_ExternalAHRS/AP_ExternalAHRS_config.h
index ed70607a14..e81aa41fe7 100644
--- a/libraries/AP_ExternalAHRS/AP_ExternalAHRS_config.h
+++ b/libraries/AP_ExternalAHRS/AP_ExternalAHRS_config.h
@@ -3,5 +3,5 @@
 #include <AP_HAL/AP_HAL_Boards.h>
 
 #ifndef HAL_EXTERNAL_AHRS_ENABLED
-#define HAL_EXTERNAL_AHRS_ENABLED !HAL_MINIMIZE_FEATURES && !defined(HAL_BUILD_AP_PERIPH) && BOARD_FLASH_SIZE > 1024
+#define HAL_EXTERNAL_AHRS_ENABLED !HAL_MINIMIZE_FEATURES && BOARD_FLASH_SIZE > 1024
 #endif