diff --git a/libraries/AP_Baro/AP_Baro_SITL.cpp b/libraries/AP_Baro/AP_Baro_SITL.cpp
index 861674360e..cd914632a3 100644
--- a/libraries/AP_Baro/AP_Baro_SITL.cpp
+++ b/libraries/AP_Baro/AP_Baro_SITL.cpp
@@ -11,9 +11,9 @@ extern const AP_HAL::HAL& hal;
   constructor - registers instance at top Baro driver
  */
 AP_Baro_SITL::AP_Baro_SITL(AP_Baro &baro) :
+    AP_Baro_Backend(baro),
     _sitl(AP::sitl()),
-    _has_sample(false),
-    AP_Baro_Backend(baro)
+    _has_sample(false)
 {
     if (_sitl != nullptr) {
         _instance = _frontend.register_sensor();