diff --git a/src/basic/user-util.c b/src/basic/user-util.c
index 858d712189631..6de5e4705ebc0 100644
--- a/src/basic/user-util.c
+++ b/src/basic/user-util.c
@@ -9,7 +9,7 @@
 #include <sys/file.h>
 #include <sys/stat.h>
 #include <unistd.h>
-#include <utmp.h>
+#include <utmpx.h>
 
 #include "sd-messages.h"
 
@@ -802,7 +802,7 @@ bool valid_user_group_name(const char *u, ValidUserFlags flags) {
                         return false;
                 if (l > NAME_MAX) /* must fit in a filename: 255 */
                         return false;
-                if (l > UT_NAMESIZE - 1) /* must fit in utmp: 31 */
+                if (l > sizeof_field(struct utmpx, ut_user) - 1) /* must fit in utmp: 31 */
                         return false;
         }
 
diff --git a/src/login/logind-core.c b/src/login/logind-core.c
index 8742fe6a97ca4..fad276f195e5c 100644
--- a/src/login/logind-core.c
+++ b/src/login/logind-core.c
@@ -710,8 +710,8 @@ int manager_read_utmp(Manager *m) {
 
         assert(m);
 
-        if (utmpxname(_PATH_UTMPX) < 0)
-                return log_error_errno(errno, "Failed to set utmp path to " _PATH_UTMPX ": %m");
+        if (utmpxname(UTMPX_FILE) < 0)
+                return log_error_errno(errno, "Failed to set utmp path to " UTMPX_FILE ": %m");
 
         utmpx = utxent_start();
 
@@ -725,9 +725,9 @@ int manager_read_utmp(Manager *m) {
                 u = getutxent();
                 if (!u) {
                         if (errno == ENOENT)
-                                log_debug_errno(errno, _PATH_UTMPX " does not exist, ignoring.");
+                                log_debug_errno(errno, UTMPX_FILE " does not exist, ignoring.");
                         else if (errno != 0)
-                                log_warning_errno(errno, "Failed to read " _PATH_UTMPX ", ignoring: %m");
+                                log_warning_errno(errno, "Failed to read " UTMPX_FILE ", ignoring: %m");
                         return 0;
                 }
 
@@ -808,9 +808,9 @@ void manager_connect_utmp(Manager *m) {
          * Yes, relying on utmp is pretty ugly, but it's good enough for informational purposes, as well as idle
          * detection (which, for tty sessions, relies on the TTY used) */
 
-        r = sd_event_add_inotify(m->event, &s, _PATH_UTMPX, IN_MODIFY|IN_MOVE_SELF|IN_DELETE_SELF|IN_ATTRIB, manager_dispatch_utmp, m);
+        r = sd_event_add_inotify(m->event, &s, UTMPX_FILE, IN_MODIFY|IN_MOVE_SELF|IN_DELETE_SELF|IN_ATTRIB, manager_dispatch_utmp, m);
         if (r < 0)
-                log_full_errno(r == -ENOENT ? LOG_DEBUG: LOG_WARNING, r, "Failed to create inotify watch on " _PATH_UTMPX ", ignoring: %m");
+                log_full_errno(r == -ENOENT ? LOG_DEBUG: LOG_WARNING, r, "Failed to create inotify watch on " UTMPX_FILE ", ignoring: %m");
         else {
                 r = sd_event_source_set_priority(s, SD_EVENT_PRIORITY_IDLE);
                 if (r < 0)
diff --git a/src/shared/utmp-wtmp.c b/src/shared/utmp-wtmp.c
index 267b350276c72..e399b1d5d7735 100644
--- a/src/shared/utmp-wtmp.c
+++ b/src/shared/utmp-wtmp.c
@@ -42,7 +42,7 @@ int utmp_get_runlevel(int *runlevel, int *previous) {
                 return 0;
         }
 
-        if (utmpxname(_PATH_UTMPX) < 0)
+        if (utmpxname(UTMPX_FILE) < 0)
                 return -errno;
 
         utmpx = utxent_start();
@@ -91,7 +91,7 @@ static int write_entry_utmp(const struct utmpx *store) {
          * each entry type resp. user; i.e. basically a key/value
          * table. */
 
-        if (utmpxname(_PATH_UTMPX) < 0)
+        if (utmpxname(UTMPX_FILE) < 0)
                 return -errno;
 
         utmpx = utxent_start();
diff --git a/src/shared/wall.c b/src/shared/wall.c
index 119d18f5a4649..b28c04cd8b3c3 100644
--- a/src/shared/wall.c
+++ b/src/shared/wall.c
@@ -51,7 +51,7 @@ static int wall_utmp(
 
         /* libc's setutxent() unfortunately doesn't inform us about success, i.e. whether /var/run/utmp
          * exists. Hence we have to check manually first. */
-        if (access(_PATH_UTMPX, F_OK) < 0) {
+        if (access(UTMPX_FILE, F_OK) < 0) {
                 if (errno == ENOENT)
                         return -ENOPROTOOPT;
 
diff --git a/src/sysusers/sysusers.c b/src/sysusers/sysusers.c
index a1ccc1f2b4b65..8ec1373479814 100644
--- a/src/sysusers/sysusers.c
+++ b/src/sysusers/sysusers.c
@@ -1,7 +1,6 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 
 #include <getopt.h>
-#include <utmp.h>
 
 #include "alloc-util.h"
 #include "build.h"
diff --git a/src/test/test-utmp.c b/src/test/test-utmp.c
index 06a0fce764af7..e94ee03250ed9 100644
--- a/src/test/test-utmp.c
+++ b/src/test/test-utmp.c
@@ -7,15 +7,9 @@
 #include "utmp-wtmp.h"
 #include "tests.h"
 
-#ifndef UT_LINESIZE
-#  define UT_LINESIZE      32
-#endif
-#ifndef UT_NAMESIZE
-#  define UT_NAMESIZE      32
-#endif
-#ifndef UT_HOSTSIZE
-#  define UT_HOSTSIZE     256
-#endif
+#define UTX_LINESIZE sizeof_field(struct utmpx, ut_line)
+#define UTX_NAMESIZE sizeof_field(struct utmpx, ut_user)
+#define UTX_HOSTSIZE sizeof_field(struct utmpx, ut_host)
 
 TEST(dump_run_utmp) {
         _unused_ _cleanup_(utxent_cleanup) bool utmpx = false;
@@ -46,11 +40,11 @@ TEST(dump_run_utmp) {
                 log_info("%14s %10"PID_PRI" line=%-7.*s id=%-4.4s name=%-8.*s session=%lu host=%.*s addr=%s",
                          type,
                          u->ut_pid,
-                         UT_LINESIZE, u->ut_line,
+                         (int) UTX_LINESIZE, u->ut_line,
                          u->ut_id,
-                         UT_NAMESIZE, u->ut_user,
+                         (int) UTX_NAMESIZE, u->ut_user,
                          (long unsigned) u->ut_session,
-                         UT_HOSTSIZE, u->ut_host,
+                         (int) UTX_HOSTSIZE, u->ut_host,
                          IN_ADDR_TO_STRING(is_ipv4 ? AF_INET : AF_INET6, &addr));
         }
 }
diff --git a/src/userdb/userdbctl.c b/src/userdb/userdbctl.c
index 9a7aab3857b35..1346e2de0126e 100644
--- a/src/userdb/userdbctl.c
+++ b/src/userdb/userdbctl.c
@@ -1,7 +1,6 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 
 #include <getopt.h>
-#include <utmp.h>
 
 #include "build.h"
 #include "dirent-util.h"