diff --git a/lib/gtp/path.h b/lib/gtp/path.h
index 6cb39ac77..7aecf6f7f 100644
--- a/lib/gtp/path.h
+++ b/lib/gtp/path.h
@@ -35,8 +35,6 @@ extern "C" {
         ogs_gtp_self()->gtpc_sock6 = \
             ogs_socknode_sock_first(&ogs_gtp_self()->gtpc_list6); \
         \
-        ogs_assert(ogs_gtp_self()->gtpc_sock || ogs_gtp_self()->gtpc_sock6); \
-        \
         if (ogs_gtp_self()->gtpc_sock) \
             ogs_gtp_self()->gtpc_addr = \
                 &ogs_gtp_self()->gtpc_sock->local_addr; \
@@ -44,8 +42,6 @@ extern "C" {
             ogs_gtp_self()->gtpc_addr6 = \
                 &ogs_gtp_self()->gtpc_sock6->local_addr; \
         \
-        ogs_assert(ogs_gtp_self()->gtpc_addr || ogs_gtp_self()->gtpc_addr6); \
-        \
     } while(0)
 
 #define OGS_SETUP_GTPU_SERVER \
diff --git a/src/mme/mme-gtp-path.c b/src/mme/mme-gtp-path.c
index 7d9e8f3f3..0ef1da82d 100644
--- a/src/mme/mme-gtp-path.c
+++ b/src/mme/mme-gtp-path.c
@@ -203,6 +203,8 @@ int mme_gtp_open(void)
     }
 
     OGS_SETUP_GTPC_SERVER;
+    ogs_assert(ogs_gtp_self()->gtpc_sock || ogs_gtp_self()->gtpc_sock6);
+    ogs_assert(ogs_gtp_self()->gtpc_addr || ogs_gtp_self()->gtpc_addr6);
 
     mme_self()->pgw_addr = mme_pgw_addr_find_by_apn_enb(
             &mme_self()->pgw_list, AF_INET, NULL);
diff --git a/src/sgwc/gtp-path.c b/src/sgwc/gtp-path.c
index 6ce21e64f..8e850e7c9 100644
--- a/src/sgwc/gtp-path.c
+++ b/src/sgwc/gtp-path.c
@@ -129,6 +129,8 @@ int sgwc_gtp_open(void)
     }
 
     OGS_SETUP_GTPC_SERVER;
+    ogs_assert(ogs_gtp_self()->gtpc_sock || ogs_gtp_self()->gtpc_sock6);
+    ogs_assert(ogs_gtp_self()->gtpc_addr || ogs_gtp_self()->gtpc_addr6);
 
     return OGS_OK;
 }
diff --git a/src/smf/gtp-path.c b/src/smf/gtp-path.c
index 8d88ee20e..f4738658d 100644
--- a/src/smf/gtp-path.c
+++ b/src/smf/gtp-path.c
@@ -251,6 +251,9 @@ int smf_gtp_open(void)
     }
 
     OGS_SETUP_GTPC_SERVER;
+    /* If we only use 5G, we don't need GTP-C, so there is no check routine. */
+    if (!ogs_gtp_self()->gtpc_sock  && !ogs_gtp_self()->gtpc_sock6)
+        ogs_warn("No GTP-C configuration");
 
     ogs_list_for_each(&ogs_gtp_self()->gtpu_list, node) {
         sock = ogs_gtp_server(node);