diff --git a/lib/gssapi/gssapi/gssapi_krb5.h b/lib/gssapi/gssapi/gssapi_krb5.h
index a0aae0ebb..f4ac8f0de 100644
--- a/lib/gssapi/gssapi/gssapi_krb5.h
+++ b/lib/gssapi/gssapi/gssapi_krb5.h
@@ -64,6 +64,7 @@ extern gss_OID GSS_KRB5_COMPAT_DES3_MIC_X;
 extern gss_OID GSS_KRB5_REGISTER_ACCEPTOR_IDENTITY_X;
 extern gss_OID GSS_KRB5_SET_DNS_CANONICALIZE_X;
 extern gss_OID GSS_KRB5_SEND_TO_KDC_X;
+extern gss_OID GSS_KRB5_SET_DEFAULT_REALM_X;
 /* Extensions inquire context */
 extern gss_OID GSS_KRB5_GET_TKT_FLAGS_X;
 extern gss_OID GSS_KRB5_EXTRACT_AUTHZ_DATA_FROM_SEC_CONTEXT_X;
diff --git a/lib/gssapi/krb5/external.c b/lib/gssapi/krb5/external.c
index 0d09bd172..79b762838 100644
--- a/lib/gssapi/krb5/external.c
+++ b/lib/gssapi/krb5/external.c
@@ -352,6 +352,13 @@ static gss_OID_desc gss_krb5_set_allowable_enctypes_x_desc =
 
 gss_OID GSS_KRB5_SET_ALLOWABLE_ENCTYPES_X = &gss_krb5_set_allowable_enctypes_x_desc;
 
+/* 1.2.752.43.13.15 */
+static gss_OID_desc gss_krb5_set_default_realm_x_desc =
+{6, rk_UNCONST("\x2a\x85\x70\x2b\x0d\x0f")};
+
+gss_OID GSS_KRB5_SET_DEFAULT_REALM_X = &gss_krb5_set_default_realm_x_desc;
+
+
 /* 1.2.752.43.14.1 */
 static gss_OID_desc gss_sasl_digest_md5_mechanism_desc =
 {6, rk_UNCONST("\x2a\x85\x70\x2b\x0e\x01") };