diff --git a/payment_terminal/drivers/bbs/messages.py b/payment_terminal/drivers/bbs/messages.py
index 832236d..5c44b96 100644
--- a/payment_terminal/drivers/bbs/messages.py
+++ b/payment_terminal/drivers/bbs/messages.py
@@ -241,7 +241,7 @@ def unpack_fields(cls, data):
         # TODO yuck yuck yuck
         fields = OrderedDict()
 
-        fields['header'], size = cls.type.read(data)
+        fields['type'], size = cls.type.unpack(data)
 
         text_data = data[size:-cls.delimiter.size]
         fields['text'], size = cls.text.unpack(text_data)