diff --git a/openair3/NGAP/ngap_gNB_nas_procedures.c b/openair3/NGAP/ngap_gNB_nas_procedures.c
index 21144e4beb..9e11cb3e64 100644
--- a/openair3/NGAP/ngap_gNB_nas_procedures.c
+++ b/openair3/NGAP/ngap_gNB_nas_procedures.c
@@ -246,7 +246,7 @@ int ngap_gNB_handle_nas_first_req(instance_t instance, ngap_nas_first_req_t *UEf
     ie->criticality = NGAP_Criticality_reject;
     ie->value.present = NGAP_InitialUEMessage_IEs__value_PR_FiveG_S_TMSI;
     AMF_SETID_TO_BIT_STRING(UEfirstReq->ue_identity.s_tmsi.amf_set_id, &ie->value.choice.FiveG_S_TMSI.aMFSetID);
-    AMF_SETID_TO_BIT_STRING(UEfirstReq->ue_identity.s_tmsi.amf_pointer, &ie->value.choice.FiveG_S_TMSI.aMFPointer);
+    AMF_POINTER_TO_BIT_STRING(UEfirstReq->ue_identity.s_tmsi.amf_pointer, &ie->value.choice.FiveG_S_TMSI.aMFPointer);
     M_TMSI_TO_OCTET_STRING(UEfirstReq->ue_identity.s_tmsi.m_tmsi, &ie->value.choice.FiveG_S_TMSI.fiveG_TMSI);
   }