diff --git a/ArduSub/GCS_Mavlink.cpp b/ArduSub/GCS_Mavlink.cpp
index 9bffd5fe9a..8362c7ab5d 100644
--- a/ArduSub/GCS_Mavlink.cpp
+++ b/ArduSub/GCS_Mavlink.cpp
@@ -202,7 +202,7 @@ void GCS_MAVLINK_Sub::send_pid_tuning()
         const AP_PIDInfo &pid_info = sub.pos_control.get_accel_z_pid().get_pid_info();
         mavlink_msg_pid_tuning_send(chan, PID_TUNING_ACCZ,
                                     pid_info.target*0.01f,
-                                    -(ahrs.get_accel_ef_blended().z + GRAVITY_MSS),
+                                    -(ahrs.get_accel_ef().z + GRAVITY_MSS),
                                     pid_info.FF*0.01f,
                                     pid_info.P*0.01f,
                                     pid_info.I*0.01f,