diff --git a/lib/sbi/nnrf-build.c b/lib/sbi/nnrf-build.c
index 53fb76a67a..4c1714ef28 100644
--- a/lib/sbi/nnrf-build.c
+++ b/lib/sbi/nnrf-build.c
@@ -64,8 +64,9 @@ OpenAPI_nf_profile_t *ogs_nnrf_nfm_build_nf_profile(
         memset(fqdn, 0, sizeof(fqdn));
         fqdn_len = ogs_fqdn_build(fqdn,
                 nf_instance->fqdn, strlen(nf_instance->fqdn));
-        NFProfile->fqdn = ogs_memdup(fqdn, fqdn_len);
+        NFProfile->fqdn = ogs_memdup(fqdn, fqdn_len+1);
         ogs_expect_or_return_val(NFProfile->fqdn, NULL);
+        NFProfile->fqdn[fqdn_len] = 0;
 
         ogs_trace("FQDN[%s]", nf_instance->fqdn);
     }
@@ -184,8 +185,9 @@ OpenAPI_nf_profile_t *ogs_nnrf_nfm_build_nf_profile(
             memset(fqdn, 0, sizeof(fqdn));
             fqdn_len = ogs_fqdn_build(fqdn,
                     nf_service->fqdn, strlen(nf_service->fqdn));
-            NFService->fqdn = ogs_memdup(fqdn, fqdn_len);
+            NFService->fqdn = ogs_memdup(fqdn, fqdn_len+1);
             ogs_expect_or_return_val(NFService->fqdn, NULL);
+            NFService->fqdn[fqdn_len] = 0;
         }
 
         IpEndPointList = OpenAPI_list_create();
diff --git a/src/bsf/nbsf-handler.c b/src/bsf/nbsf-handler.c
index f626c38c5a..22d51198be 100644
--- a/src/bsf/nbsf-handler.c
+++ b/src/bsf/nbsf-handler.c
@@ -227,8 +227,9 @@ bool bsf_nbsf_management_handle_pcf_binding(
                     memset(fqdn, 0, sizeof(fqdn));
                     fqdn_len = ogs_fqdn_build(fqdn,
                             sess->pcf_fqdn, strlen(sess->pcf_fqdn));
-                    SendPcfBinding.pcf_fqdn = ogs_memdup(fqdn, fqdn_len);
+                    SendPcfBinding.pcf_fqdn = ogs_memdup(fqdn, fqdn_len+1);
                     ogs_assert(SendPcfBinding.pcf_fqdn);
+                    SendPcfBinding.pcf_fqdn[fqdn_len] = 0;
                 }
 
                 for (i = 0; i < sess->num_of_pcf_ip; i++) {
diff --git a/src/pcf/nbsf-build.c b/src/pcf/nbsf-build.c
index a694876916..86c706f580 100644
--- a/src/pcf/nbsf-build.c
+++ b/src/pcf/nbsf-build.c
@@ -69,8 +69,9 @@ ogs_sbi_request_t *pcf_nbsf_management_build_register(
         memset(fqdn, 0, sizeof(fqdn));
         fqdn_len = ogs_fqdn_build(fqdn,
                 nf_service->fqdn, strlen(nf_service->fqdn));
-        PcfBinding.pcf_fqdn = ogs_memdup(fqdn, fqdn_len);
+        PcfBinding.pcf_fqdn = ogs_memdup(fqdn, fqdn_len+1);
         ogs_expect_or_return_val(PcfBinding.pcf_fqdn, NULL);
+        PcfBinding.pcf_fqdn[fqdn_len] = 0;
     }
 
     PcfIpEndPointList = OpenAPI_list_create();