diff --git a/adafruit_bluefruit_connect/magnetometer_packet.py b/adafruit_bluefruit_connect/magnetometer_packet.py
index 5cd5eac..dd7b272 100644
--- a/adafruit_bluefruit_connect/magnetometer_packet.py
+++ b/adafruit_bluefruit_connect/magnetometer_packet.py
@@ -31,12 +31,12 @@
 
 from ._xyz_packet import _XYZPacket
 
-class AccelerometerPacket(_XYZPacket):
+class MagnetometerPacket(_XYZPacket):
     """A packet of x, y, z float values from a magnetometer."""
 
     # Everything else is handled by _XYZPacket.
-    _TYPE_HEADER = b'!A'
+    _TYPE_HEADER = b'!M'
 
 
 # Register this class with the superclass. This allows the user to import only what is needed.
-AccelerometerPacket.register_packet_type()
+MagnetometerPacket.register_packet_type()