diff --git a/common.py b/common.py
index 90e4786..6f8d406 100644
--- a/common.py
+++ b/common.py
@@ -4,6 +4,7 @@ from pathlib import Path
 from typing import cast
 
 from spacepackets import SpacePacket, SpacePacketHeader
+from spacepackets.ccsds import SPACE_PACKET_HEADER_SIZE
 from spacepackets.cfdp import (
     TransmissionMode,
     ChecksumType,
@@ -156,9 +157,9 @@ class CfdpInCcsdsWrapper(SpecificApidHandlerBase):
         self.handler = cfdp_in_ccsds_handler
 
     def handle_tm(self, packet: bytes, _user_args: any):
-        ccsds_header_raw = packet[0:6]
-        sp_header = SpacePacketHeader.unpack(ccsds_header_raw)
-        pdu = packet[6:]
+        # Ignore the space packet header. Its only purpose is to use the same protocol and
+        # have a seaprate APID for space packets. If this function is called, the APID is correct.
+        pdu = packet[SPACE_PACKET_HEADER_SIZE:]
         pdu_base = PduFactory.from_raw(pdu)
         if pdu_base.pdu_type == PduType.FILE_DATA:
             LOGGER.info("Received File Data PDU TM")