diff --git a/openair2/ENB_APP/flexran_agent_ran_api.c b/openair2/ENB_APP/flexran_agent_ran_api.c
index d126012737..5377b03ae9 100644
--- a/openair2/ENB_APP/flexran_agent_ran_api.c
+++ b/openair2/ENB_APP/flexran_agent_ran_api.c
@@ -3491,22 +3491,22 @@ int flexran_add_s1ap_mme(mid_t mod_id, size_t n_mme, char **mme_ipv4) {
     S1AP_REGISTER_ENB_REQ(m).broadcast_plmn_num[n] = mme->broadcast_plmn_num;
     for (int i = 0; i < mme->broadcast_plmn_num; ++i)
       S1AP_REGISTER_ENB_REQ(m).broadcast_plmn_index[n][i] = mme->broadcast_plmn_index[i];
+    S1AP_REGISTER_ENB_REQ(m).mme_port[n] = mme->mme_port;
     S1AP_REGISTER_ENB_REQ(m).nb_mme += 1;
   }
 
   if (S1AP_REGISTER_ENB_REQ(m).nb_mme + n_mme > S1AP_MAX_NB_MME_IP_ADDRESS)
     return -1;
 
-  for (int i = 0; i < n_mme; ++i) {
-    const int n = S1AP_REGISTER_ENB_REQ(m).nb_mme;
-    strcpy(S1AP_REGISTER_ENB_REQ(m).mme_ip_address[n].ipv4_address, mme_ipv4[0]);
-    S1AP_REGISTER_ENB_REQ(m).mme_ip_address[n].ipv4 = 1;
-    S1AP_REGISTER_ENB_REQ(m).mme_ip_address[n].ipv6 = 0;
-    S1AP_REGISTER_ENB_REQ(m).broadcast_plmn_num[n] = S1AP_REGISTER_ENB_REQ(m).num_plmn;
-    for (int i = 0; i < S1AP_REGISTER_ENB_REQ(m).num_plmn; ++i)
-      S1AP_REGISTER_ENB_REQ(m).broadcast_plmn_index[n][i] = i;
-    S1AP_REGISTER_ENB_REQ(m).nb_mme += 1;
-  }
+  const int n = S1AP_REGISTER_ENB_REQ(m).nb_mme;
+  strcpy(S1AP_REGISTER_ENB_REQ(m).mme_ip_address[n].ipv4_address, mme_ipv4[0]);
+  S1AP_REGISTER_ENB_REQ(m).mme_ip_address[n].ipv4 = 1;
+  S1AP_REGISTER_ENB_REQ(m).mme_ip_address[n].ipv6 = 0;
+  S1AP_REGISTER_ENB_REQ(m).broadcast_plmn_num[n] = S1AP_REGISTER_ENB_REQ(m).num_plmn;
+  for (int i = 0; i < S1AP_REGISTER_ENB_REQ(m).num_plmn; ++i)
+    S1AP_REGISTER_ENB_REQ(m).broadcast_plmn_index[n][i] = i;
+  S1AP_REGISTER_ENB_REQ(m).mme_port[n] = S1AP_PORT_NUMBER;
+  S1AP_REGISTER_ENB_REQ(m).nb_mme += 1;
 
   itti_send_msg_to_task (TASK_S1AP, ENB_MODULE_ID_TO_INSTANCE(mod_id), m);
 
diff --git a/openair3/S1AP/s1ap_eNB.c b/openair3/S1AP/s1ap_eNB.c
index 2a153acaa2..bb8633ba17 100644
--- a/openair3/S1AP/s1ap_eNB.c
+++ b/openair3/S1AP/s1ap_eNB.c
@@ -127,6 +127,7 @@ static void s1ap_eNB_register_mme(s1ap_eNB_instance_t *instance_p,
     memcpy(&s1ap_mme_data_p->mme_s1_ip,
     	   mme_ip_address,
     	   sizeof(*mme_ip_address));
+    s1ap_mme_data_p->mme_port = mme_port;
     for (int i = 0; i < broadcast_plmn_num; ++i)
       s1ap_mme_data_p->broadcast_plmn_index[i] = broadcast_plmn_index[i];
 
diff --git a/openair3/S1AP/s1ap_eNB_defs.h b/openair3/S1AP/s1ap_eNB_defs.h
index d4bc6cfc0f..d8a8da8001 100644
--- a/openair3/S1AP/s1ap_eNB_defs.h
+++ b/openair3/S1AP/s1ap_eNB_defs.h
@@ -124,8 +124,9 @@ typedef struct s1ap_eNB_mme_data_s {
   /* This is the optional name provided by the MME */
   char *mme_name;
 
-  /* MME S1AP IP address */
+  /* MME S1AP IP address and port */
   net_ip_address_t mme_s1_ip;
+  uint16_t         mme_port;
 
   /* List of served GUMMEI per MME. There is one GUMMEI per RAT with a max
    * number of 8 RATs but in our case only one is used. The LTE related pool