diff --git a/libraries/AP_IRLock/AP_IRLock_SITL.cpp b/libraries/AP_IRLock/AP_IRLock_SITL.cpp
index f54c483d97..954bc62e6f 100644
--- a/libraries/AP_IRLock/AP_IRLock_SITL.cpp
+++ b/libraries/AP_IRLock/AP_IRLock_SITL.cpp
@@ -41,9 +41,9 @@ bool AP_IRLock_SITL::update()
     }
 
     if (_sitl->precland_sim.last_update_ms() != _last_timestamp) {
-        const Vector3f position = _sitl->precland_sim.get_target_position();
-        const Matrix3f &body_to_ned = AP::ahrs().get_rotation_body_to_ned();
-        const Vector3f real_position =  body_to_ned.mul_transpose(-position);
+        const Vector3d position = _sitl->precland_sim.get_target_position();
+        const Matrix3d body_to_ned = AP::ahrs().get_rotation_body_to_ned().todouble();
+        const Vector3d real_position =  body_to_ned.mul_transpose(-position);
         _last_timestamp = _sitl->precland_sim.last_update_ms();
         _last_update_ms = _last_timestamp;
         _target_info.timestamp = _last_timestamp;