diff --git a/lib/src/upper/pdcp_entity_nr.cc b/lib/src/upper/pdcp_entity_nr.cc
index 1ed0e1549..467fb96f2 100644
--- a/lib/src/upper/pdcp_entity_nr.cc
+++ b/lib/src/upper/pdcp_entity_nr.cc
@@ -159,6 +159,7 @@ void pdcp_entity_nr::write_pdu(unique_byte_buffer_t pdu)
 
   // Extract RCVD_SN from header
   uint32_t rcvd_sn = read_data_header(pdu);
+  discard_data_header(pdu); // FIXME Check wheather the header is part of integrity check.
 
   // Extract MAC
   uint8_t mac[4];