diff --git a/openair2/GNB_APP/gnb_config.c b/openair2/GNB_APP/gnb_config.c
index cae1e6acf8..d713d17d74 100644
--- a/openair2/GNB_APP/gnb_config.c
+++ b/openair2/GNB_APP/gnb_config.c
@@ -814,6 +814,7 @@ int RCconfig_NR_NG(MessageDef *msg_p, uint32_t i) {
             paramdef_t SCTPParams[]  = GNBSCTPPARAMS_DESC;
             paramdef_t NETParams[]  =  GNBNETPARAMS_DESC;
             char aprefix[MAX_OPTNAME_SIZE*2 + 8];
+	    sprintf(aprefix, "%s.[%i]", GNB_CONFIG_STRING_GNB_LIST, k);
             
             NGAP_REGISTER_GNB_REQ (msg_p).gNB_id = gnb_id;