diff --git a/openair1/SIMULATION/NR_PHY/dlsim.c b/openair1/SIMULATION/NR_PHY/dlsim.c
index 54c3a68631..11f5d439ea 100644
--- a/openair1/SIMULATION/NR_PHY/dlsim.c
+++ b/openair1/SIMULATION/NR_PHY/dlsim.c
@@ -172,6 +172,10 @@ gtpv1u_update_ngu_tunnel(
   return 0;
 }
 
+int ocp_gtpv1u_delete_s1u_tunnel(const instance_t instance, const gtpv1u_enb_delete_tunnel_req_t *const req_pP) {
+  return 0;
+}
+
 int
 nr_rrc_gNB_process_GTPV1U_CREATE_TUNNEL_RESP(
   const protocol_ctxt_t *const ctxt_pP,
diff --git a/openair1/SIMULATION/NR_PHY/prachsim.c b/openair1/SIMULATION/NR_PHY/prachsim.c
index 7fcbf8256b..93bed5514f 100644
--- a/openair1/SIMULATION/NR_PHY/prachsim.c
+++ b/openair1/SIMULATION/NR_PHY/prachsim.c
@@ -133,6 +133,10 @@ gtpv1u_update_ngu_tunnel(
   return 0;
 }
 
+int ocp_gtpv1u_delete_s1u_tunnel(const instance_t instance, const gtpv1u_enb_delete_tunnel_req_t *const req_pP) {
+  return 0;
+}
+
 int
 nr_rrc_gNB_process_GTPV1U_CREATE_TUNNEL_RESP(
   const protocol_ctxt_t *const ctxt_pP,
diff --git a/openair1/SIMULATION/NR_PHY/ulsim.c b/openair1/SIMULATION/NR_PHY/ulsim.c
index 1c28591aba..62f4420e75 100644
--- a/openair1/SIMULATION/NR_PHY/ulsim.c
+++ b/openair1/SIMULATION/NR_PHY/ulsim.c
@@ -136,6 +136,10 @@ gtpv1u_create_s1u_tunnel(
   return 0;
 }
 
+int ocp_gtpv1u_delete_s1u_tunnel(const instance_t instance, const gtpv1u_enb_delete_tunnel_req_t *const req_pP) {
+  return 0;
+}
+
 int
 rrc_gNB_process_GTPV1U_CREATE_TUNNEL_RESP(
   const protocol_ctxt_t *const ctxt_pP,