diff --git a/ArduPlane/system.cpp b/ArduPlane/system.cpp
index b29d5a9bfe..2a2c0fb660 100644
--- a/ArduPlane/system.cpp
+++ b/ArduPlane/system.cpp
@@ -324,8 +324,8 @@ void Plane::check_long_failsafe()
             failsafe_long_on_event(FAILSAFE_GCS, ModeReason::GCS_FAILSAFE);
         } else if (g.gcs_heartbeat_fs_enabled == GCS_FAILSAFE_HB_RSSI && 
                    gcs().chan(0) != nullptr &&
-                   gcs().chan(0)->last_radio_status_remrssi_ms != 0 &&
-                   (tnow - gcs().chan(0)->last_radio_status_remrssi_ms) > g.fs_timeout_long*1000) {
+                   gcs().chan(0)->last_radio_status_remrssi_ms() != 0 &&
+                   (tnow - gcs().chan(0)->last_radio_status_remrssi_ms()) > g.fs_timeout_long*1000) {
             failsafe_long_on_event(FAILSAFE_GCS, ModeReason::GCS_FAILSAFE);
         }
     } else {