diff --git a/srsue/hdr/stack/upper/nas_5g.h b/srsue/hdr/stack/upper/nas_5g.h
index c953cbf4a..854bec922 100644
--- a/srsue/hdr/stack/upper/nas_5g.h
+++ b/srsue/hdr/stack/upper/nas_5g.h
@@ -125,8 +125,7 @@ private:
   int send_registration_request();
   int send_authentication_response(const uint8_t res[16]);
   int send_security_mode_reject(const srsran::nas_5g::cause_5gmm_t::cause_5gmm_type_::options cause);
-  int send_authentication_failure(const srsran::nas_5g::cause_5gmm_t::cause_5gmm_type_::options cause,
-                                  const uint8_t*                                                auth_fail_param);
+  int send_authentication_failure(const srsran::nas_5g::cause_5gmm_t::cause_5gmm_type_::options cause);
   int send_security_mode_complete(const srsran::nas_5g::security_mode_command_t& security_mode_command);
   int send_registration_complete();
   int send_pdu_session_establishment_request(uint32_t                 transaction_identity,
diff --git a/srsue/src/stack/upper/nas_5g.cc b/srsue/src/stack/upper/nas_5g.cc
index f70cdbfca..3c607467b 100644
--- a/srsue/src/stack/upper/nas_5g.cc
+++ b/srsue/src/stack/upper/nas_5g.cc
@@ -457,8 +457,7 @@ int nas_5g::send_security_mode_complete(const srsran::nas_5g::security_mode_comm
   return SRSRAN_SUCCESS;
 }
 
-int nas_5g::send_authentication_failure(const cause_5gmm_t::cause_5gmm_type_::options cause,
-                                        const uint8_t*                                auth_fail_param)
+int nas_5g::send_authentication_failure(const cause_5gmm_t::cause_5gmm_type_::options cause)
 {
   unique_byte_buffer_t pdu = srsran::make_byte_buffer();
   if (!pdu) {
@@ -785,10 +784,10 @@ int nas_5g::handle_authentication_request(authentication_request_t& authenticati
 
   } else if (auth_result == AUTH_FAILED) {
     logger.error("Network authentication failure.");
-    send_authentication_failure(cause_5gmm_t::cause_5gmm_type::mac_failure, res);
+    send_authentication_failure(cause_5gmm_t::cause_5gmm_type::mac_failure);
   } else if (auth_result == AUTH_SYNCH_FAILURE) {
     logger.error("Network authentication synchronization failure.");
-    send_authentication_failure(cause_5gmm_t::cause_5gmm_type::synch_failure, res);
+    send_authentication_failure(cause_5gmm_t::cause_5gmm_type::synch_failure);
   } else {
     logger.error("Unhandled authentication failure cause");
   }