diff --git a/adafruit_ble_radio.py b/adafruit_ble_radio.py
index fdb1bfb..5f5aadb 100644
--- a/adafruit_ble_radio.py
+++ b/adafruit_ble_radio.py
@@ -65,7 +65,7 @@
 class _RadioAdvertisement(Advertisement):
     """Broadcast arbitrary bytes as a radio message."""
 
-    prefix = struct.pack("<BBH", 0x3, 0xFF, _ADAFRUIT_COMPANY_ID)
+    match_prefixes = (struct.pack("<BH", 0xFF, _ADAFRUIT_COMPANY_ID),)
     manufacturer_data = LazyObjectField(
         ManufacturerData,
         "manufacturer_data",