diff --git a/libraries/AP_ADSB/AP_ADSB_Backend.cpp b/libraries/AP_ADSB/AP_ADSB_Backend.cpp
index 3797694300..3bee658a01 100644
--- a/libraries/AP_ADSB/AP_ADSB_Backend.cpp
+++ b/libraries/AP_ADSB/AP_ADSB_Backend.cpp
@@ -21,8 +21,8 @@
   base class constructor.
 */
 AP_ADSB_Backend::AP_ADSB_Backend(AP_ADSB &frontend, uint8_t instance) :
-    _frontend(frontend),
-    _instance(instance)
+    _instance(instance),
+    _frontend(frontend)
 {
 }