diff --git a/libraries/AP_AHRS/AP_AHRS.h b/libraries/AP_AHRS/AP_AHRS.h
index 3c9bb1ba7e..f69d12f47b 100644
--- a/libraries/AP_AHRS/AP_AHRS.h
+++ b/libraries/AP_AHRS/AP_AHRS.h
@@ -40,12 +40,6 @@
 # define AHRS_EKF_USE_ALWAYS     0
 #endif
 
-#if APM_BUILD_TYPE(APM_BUILD_ArduPlane)
-#define AHRS_EKF_USE_DEFAULT    1
-#else
-#define AHRS_EKF_USE_DEFAULT    0
-#endif
-
 #define AP_AHRS_TRIM_LIMIT 10.0f        // maximum trim angle in degrees
 #define AP_AHRS_RP_P_MIN   0.05f        // minimum value for AHRS_RP_P parameter
 #define AP_AHRS_YAW_P_MIN  0.05f        // minimum value for AHRS_YAW_P parameter