diff --git a/ArduPlane/ArduPlane.cpp b/ArduPlane/ArduPlane.cpp
index 7fc2743212..287cd45612 100644
--- a/ArduPlane/ArduPlane.cpp
+++ b/ArduPlane/ArduPlane.cpp
@@ -990,7 +990,7 @@ void Plane::update_flight_stage(void)
                     set_flight_stage(AP_SpdHgtControl::FLIGHT_LAND_PREFLARE);
                 } else if (flight_stage != AP_SpdHgtControl::FLIGHT_LAND_APPROACH) {
                     bool heading_lined_up = abs(nav_controller->bearing_error_cd()) < 1000 && !nav_controller->data_is_stale();
-                    bool on_flight_line = abs(nav_controller->crosstrack_error() < 5) && !nav_controller->data_is_stale();
+                    const bool on_flight_line = fabs(nav_controller->crosstrack_error()) < 5.0f && !nav_controller->data_is_stale();
                     bool below_prev_WP = current_loc.alt < prev_WP_loc.alt;
                     if ((mission.get_prev_nav_cmd_id() == MAV_CMD_NAV_LOITER_TO_ALT) ||
                         (auto_state.wp_proportion >= 0 && heading_lined_up && on_flight_line) ||