diff --git a/libraries/AP_AHRS/AP_AHRS.h b/libraries/AP_AHRS/AP_AHRS.h
index ed813ab7ac..1a7d101ca3 100644
--- a/libraries/AP_AHRS/AP_AHRS.h
+++ b/libraries/AP_AHRS/AP_AHRS.h
@@ -364,7 +364,7 @@ public:
 
     // return a Down position relative to home in meters
     // if EKF is unavailable will return the baro altitude
-    virtual void get_relative_position_D_home(float &posD) const WARN_IF_UNUSED = 0;
+    virtual void get_relative_position_D_home(float &posD) const = 0;
 
     // return a Down position relative to origin in meters
     // Return true if estimate is valid