diff --git a/ArduSub/GCS_Mavlink.cpp b/ArduSub/GCS_Mavlink.cpp
index 4f1d8bae86..699088bf3b 100644
--- a/ArduSub/GCS_Mavlink.cpp
+++ b/ArduSub/GCS_Mavlink.cpp
@@ -845,3 +845,4 @@ int32_t GCS_MAVLINK_Sub::global_position_int_relative_alt() const {
 
 // dummy method to avoid linking AFS
 bool AP_AdvancedFailsafe::gcs_terminate(bool should_terminate, const char *reason) { return false; }
+AP_AdvancedFailsafe *AP::advancedfailsafe() { return nullptr; }