diff --git a/libraries/AP_NavEKF/AP_NavEKF.cpp b/libraries/AP_NavEKF/AP_NavEKF.cpp
index cb35536436..9590abe02b 100644
--- a/libraries/AP_NavEKF/AP_NavEKF.cpp
+++ b/libraries/AP_NavEKF/AP_NavEKF.cpp
@@ -4262,7 +4262,7 @@ void NavEKF::readMagData()
         // check if compass offsets have ben changed and adjust EKF bias states to maintain consistent innovations
         if (_ahrs->get_compass()->healthy(0)) {
             Vector3f nowMagOffsets = _ahrs->get_compass()->get_offsets(0);
-            bool changeDetected = (!AP_Math::is_equal(nowMagOffsets.x,lastMagOffsets.x) || !AP_Math::is_equal(nowMagOffsets.y,lastMagOffsets.y) || !AP_Math::is_equal(nowMagOffsets.z,lastMagOffsets.z));
+            bool changeDetected = (!is_equal(nowMagOffsets.x,lastMagOffsets.x) || !is_equal(nowMagOffsets.y,lastMagOffsets.y) || !is_equal(nowMagOffsets.z,lastMagOffsets.z));
             // Ignore bias changes before final mag field and yaw initialisation, as there may have been a compass calibration
             if (changeDetected && secondMagYawInit) {
                 state.body_magfield.x += (nowMagOffsets.x - lastMagOffsets.x) * 0.001f;