diff --git a/ArduPlane/mode_thermal.cpp b/ArduPlane/mode_thermal.cpp
index 1ad42fe7d4..812f2c12f5 100644
--- a/ArduPlane/mode_thermal.cpp
+++ b/ArduPlane/mode_thermal.cpp
@@ -114,8 +114,10 @@ void ModeThermal::update_soaring()
 
 void ModeThermal::navigate()
 {
-    // Zero indicates to use WP_LOITER_RAD
-    plane.update_loiter(0);
+    // Soaring library calculates radius from SOAR_THML_BANK.
+    const float radius = plane.g2.soaring_controller.get_thermalling_radius();
+
+    plane.update_loiter(radius);
 }
 
 bool ModeThermal::exit_heading_aligned() const