diff --git a/msg/sensor_combined.msg b/msg/sensor_combined.msg
index 9d30d7fdce..ec58e6f923 100644
--- a/msg/sensor_combined.msg
+++ b/msg/sensor_combined.msg
@@ -55,7 +55,6 @@ uint64[3] magnetometer_timestamp	# Magnetometer timestamp
 uint32[3] magnetometer_priority			# Sensor priority
 uint32[3] magnetometer_errcount		# Error counter for mag 0
 float32[3] magnetometer_temp		# Temperature of mag 0
-uint8[3] mag_ext			# 0 if internal, 1 if external
 
 float32[3] baro_pres_mbar			# Barometric pressure, already temp. comp.
 float32[3] baro_alt_meter			# Altitude, already temp. comp.