diff --git a/pySim/ts_31_103.py b/pySim/ts_31_103.py
index 0b0a4f1..8209845 100644
--- a/pySim/ts_31_103.py
+++ b/pySim/ts_31_103.py
@@ -124,7 +124,7 @@
         return enc_addr_tlv(json_in)
 
 # TS 31.103 Section 4.2.9
-class EF_GBABP(LinFixedEF):
+class EF_GBABP(TransparentEF):
     def __init__(self, fid='6fd5', sfid=None, name='EF.GBABP', desc='GBA Bootstrappng'):
         super().__init__(fid=fid, sfid=sfid, name=name, desc=desc)