diff --git a/Makefile.am b/Makefile.am
index 60a171f528..a0bd0e0706 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -2329,8 +2329,6 @@ src_libnm_systemd_core_libnm_systemd_core_la_libadd = \
 
 src_libnm_systemd_core_libnm_systemd_core_la_SOURCES = \
 	src/libnm-systemd-core/nm-default-systemd-core.h \
-	src/libnm-systemd-core/nm-sd-utils-core.c \
-	src/libnm-systemd-core/nm-sd-utils-core.h \
 	src/libnm-systemd-core/nm-sd.c \
 	src/libnm-systemd-core/nm-sd.h \
 	src/libnm-systemd-core/nm-sd-utils-dhcp.h \
diff --git a/src/core/tests/test-core.c b/src/core/tests/test-core.c
index b4e1c4d5f3..11a7f32349 100644
--- a/src/core/tests/test-core.c
+++ b/src/core/tests/test-core.c
@@ -15,7 +15,6 @@
 #include "NetworkManagerUtils.h"
 #include "libnm-core-intern/nm-core-internal.h"
 #include "nm-core-utils.h"
-#include "libnm-systemd-core/nm-sd-utils-core.h"
 
 #include "dns/nm-dns-manager.h"
 #include "nm-connectivity.h"
@@ -2314,7 +2313,6 @@ test_dns_create_resolv_conf(void)
 static void
 test_machine_id_read(void)
 {
-    NMUuid        machine_id_sd;
     const NMUuid *machine_id;
     char          machine_id_str[33];
     gpointer      logstate;
@@ -2346,27 +2344,6 @@ test_machine_id_read(void)
              == machine_id_str);
     g_assert(strlen(machine_id_str) == 32);
     g_assert_cmpstr(machine_id_str, ==, nm_utils_machine_id_str());
-
-    /* double check with systemd's implementation... */
-    if (!nm_sd_utils_id128_get_machine(&machine_id_sd)) {
-        /* if systemd failed to read /etc/machine-id, the file likely
-         * is invalid. Our machine-id is fake, and we have nothing to
-         * compare against. */
-
-        if (g_file_test(LOCALSTATEDIR "/lib/dbus/machine-id", G_FILE_TEST_EXISTS)) {
-            /* Hm. So systemd failed to read /etc/machine-id, but we may have the one from D-Bus.
-             * With LOCALSTATEDIR"/lib/dbus/machine-id", we don't really know whether we
-             * parsed that file. Assume we don't know and skip the test on this system. */
-            g_assert(!nm_utils_machine_id_is_fake());
-            return;
-        }
-
-        /* OK, in this case, our function should have generated a random machine ID. */
-        g_assert(nm_utils_machine_id_is_fake());
-    } else {
-        g_assert(!nm_utils_machine_id_is_fake());
-        g_assert_cmpmem(&machine_id_sd, sizeof(NMUuid), machine_id, 16);
-    }
 }
 
 /*****************************************************************************/
diff --git a/src/libnm-systemd-core/meson.build b/src/libnm-systemd-core/meson.build
index 80b95c4224..8bbc02a7c2 100644
--- a/src/libnm-systemd-core/meson.build
+++ b/src/libnm-systemd-core/meson.build
@@ -25,7 +25,6 @@ libnm_systemd_core = static_library(
     'src/libsystemd/sd-id128/id128-util.c',
     'src/libsystemd/sd-id128/sd-id128.c',
     'nm-sd.c',
-    'nm-sd-utils-core.c',
     'nm-sd-utils-dhcp.c',
     'sd-adapt-core/nm-sd-adapt-core.c',
   ),
diff --git a/src/libnm-systemd-core/nm-sd-utils-core.c b/src/libnm-systemd-core/nm-sd-utils-core.c
deleted file mode 100644
index 21e8a3044e..0000000000
--- a/src/libnm-systemd-core/nm-sd-utils-core.c
+++ /dev/null
@@ -1,27 +0,0 @@
-/* SPDX-License-Identifier: LGPL-2.1-or-later */
-/*
- * Copyright (C) 2018 Red Hat, Inc.
- */
-
-#include "libnm-systemd-core/nm-default-systemd-core.h"
-
-#include "nm-sd-utils-core.h"
-
-#include "libnm-glib-aux/nm-uuid.h"
-
-#include "nm-sd-adapt-core.h"
-
-#include "sd-id128.h"
-
-/*****************************************************************************/
-
-NMUuid *
-nm_sd_utils_id128_get_machine(NMUuid *out_uuid)
-{
-    g_assert(out_uuid);
-
-    G_STATIC_ASSERT_EXPR(sizeof(*out_uuid) == sizeof(sd_id128_t));
-    if (sd_id128_get_machine((sd_id128_t *) out_uuid) < 0)
-        return NULL;
-    return out_uuid;
-}
diff --git a/src/libnm-systemd-core/nm-sd-utils-core.h b/src/libnm-systemd-core/nm-sd-utils-core.h
deleted file mode 100644
index ccad002989..0000000000
--- a/src/libnm-systemd-core/nm-sd-utils-core.h
+++ /dev/null
@@ -1,17 +0,0 @@
-/* SPDX-License-Identifier: LGPL-2.1-or-later */
-/*
- * Copyright (C) 2018 Red Hat, Inc.
- */
-
-#ifndef __NM_SD_UTILS_CORE_H__
-#define __NM_SD_UTILS_CORE_H__
-
-/*****************************************************************************/
-
-struct _NMUuid;
-
-struct _NMUuid *nm_sd_utils_id128_get_machine(struct _NMUuid *out_uuid);
-
-/*****************************************************************************/
-
-#endif /* __NM_SD_UTILS_CORE_H__ */