diff --git a/pySim/tlv.py b/pySim/tlv.py
index 4de5046..5acc781 100644
--- a/pySim/tlv.py
+++ b/pySim/tlv.py
@@ -100,7 +100,7 @@
 
     # not an abstractmethod, as it is only required if no _construct exists
     def _to_bytes(self):
-        raise NotImplementedError
+        raise NotImplementedError('%s._to_bytes' % type(self).__name__)
 
     def from_bytes(self, do: bytes):
         """Convert from binary bytes to internal representation. Store the decoded result
@@ -118,7 +118,7 @@
 
     # not an abstractmethod, as it is only required if no _construct exists
     def _from_bytes(self, do: bytes):
-        raise NotImplementedError
+        raise NotImplementedError('%s._from_bytes' % type(self).__name__)
 
 
 class IE(Transcodable, metaclass=TlvMeta):