diff --git a/man/systemd.xml b/man/systemd.xml
index fe1719fc18..468edfb2d3 100644
--- a/man/systemd.xml
+++ b/man/systemd.xml
@@ -585,6 +585,17 @@
         for --user instances).</para></listitem>
       </varlistentry>
 
+      <varlistentry>
+        <term><constant>SIGRTMIN+25</constant></term>
+
+        <listitem><para>Upon receiving this signal the systemd manager will reexecute itself. This
+        is mostly equivalent to <command>systemctl daemon-reexec</command> except that it will be
+        done asynchronously.</para>
+
+        <para>The systemd system manager treats this signal the same way as
+        <constant>SIGTERM</constant>.</para></listitem>
+      </varlistentry>
+
       <varlistentry>
         <term><constant>SIGRTMIN+26</constant></term>
 
diff --git a/src/core/manager.c b/src/core/manager.c
index a3607ea44f..24dfe9fc06 100644
--- a/src/core/manager.c
+++ b/src/core/manager.c
@@ -578,8 +578,7 @@ static int manager_setup_signals(Manager *m) {
                         SIGRTMIN+22, /* systemd: set log level to LOG_DEBUG */
                         SIGRTMIN+23, /* systemd: set log level to LOG_INFO */
                         SIGRTMIN+24, /* systemd: Immediate exit (--user only) */
-
-                        /* .. one free signal here ... */
+                        SIGRTMIN+25, /* systemd: reexecute manager */
 
                         /* Apparently Linux on hppa had fewer RT signals until v3.18,
                          * SIGRTMAX was SIGRTMIN+25, and then SIGRTMIN was lowered,
@@ -2846,6 +2845,10 @@ static int manager_dispatch_signal_fd(sd_event_source *source, int fd, uint32_t
                         /* This is a nop on init */
                         break;
 
+                case 25:
+                        m->objective = MANAGER_REEXECUTE;
+                        break;
+
                 case 26:
                 case 29: /* compatibility: used to be mapped to LOG_TARGET_SYSLOG_OR_KMSG */
                         manager_restore_original_log_target(m);