diff --git a/nfapi/oai_integration/nfapi_pnf.h b/nfapi/oai_integration/nfapi_pnf.h
index b7ebdb36ea..0d27a486da 100644
--- a/nfapi/oai_integration/nfapi_pnf.h
+++ b/nfapi/oai_integration/nfapi_pnf.h
@@ -19,6 +19,8 @@
  *      contact@openairinterface.org
  */
 
+#ifndef NFAPI_PNF_H_
+#define NFAPI_PNF_H_
 
 extern nfapi_ue_release_request_body_t release_rntis;
 int oai_nfapi_rach_ind(nfapi_rach_indication_t *rach_ind);
@@ -36,3 +38,4 @@ int oai_nfapi_nr_srs_indication(nfapi_nr_srs_indication_t *ind);
 int oai_nfapi_nr_uci_indication(nfapi_nr_uci_indication_t *ind);
 int oai_nfapi_nr_rach_indication(nfapi_nr_rach_indication_t *ind);
 
+#endif /* NFAPI_PNF_H_ */
diff --git a/nfapi/oai_integration/nfapi_vnf.h b/nfapi/oai_integration/nfapi_vnf.h
index 12126465fe..1dbb319d83 100644
--- a/nfapi/oai_integration/nfapi_vnf.h
+++ b/nfapi/oai_integration/nfapi_vnf.h
@@ -19,9 +19,12 @@
  *      contact@openairinterface.org
  */
 
+#ifndef NFAPI_VNF_H_
+#define NFAPI_VNF_H_
 
 void configure_nfapi_vnf(char *vnf_addr, int vnf_p5_port, char *pnf_ip_addr, int pnf_p7_port, int vnf_p7_port);
 void configure_nr_nfapi_vnf(char *vnf_addr, int vnf_p5_port, char *pnf_ip_addr, int pnf_p7_port, int vnf_p7_port);
 
 uint32_t sfnslot_add_slot(uint16_t sfn, uint16_t slot, int offset);
 
+#endif /* NFAPI_VNF_H_ */