diff --git a/ArduPlane/GCS_Mavlink.cpp b/ArduPlane/GCS_Mavlink.cpp
index 7a9313c2c2..aabcd2bb5a 100644
--- a/ArduPlane/GCS_Mavlink.cpp
+++ b/ArduPlane/GCS_Mavlink.cpp
@@ -432,7 +432,7 @@ uint32_t GCS_MAVLINK_Plane::telem_delay() const
 // try to send a message, return false if it won't fit in the serial tx buffer
 bool GCS_MAVLINK_Plane::try_send_message(enum ap_message id)
 {
-    if (telemetry_delayed(chan)) {
+    if (telemetry_delayed()) {
         return false;
     }
 
diff --git a/ArduPlane/Plane.h b/ArduPlane/Plane.h
index 65cae85776..718ba1bcf1 100644
--- a/ArduPlane/Plane.h
+++ b/ArduPlane/Plane.h
@@ -821,7 +821,6 @@ private:
 
     void send_aoa_ssa(mavlink_channel_t chan);
 
-    bool telemetry_delayed(mavlink_channel_t chan);
     void gcs_data_stream_send(void);
     void gcs_update(void);
     void gcs_send_airspeed_calibration(const Vector3f &vg);