diff --git a/src/core/manager-serialize.c b/src/core/manager-serialize.c
index 62dfce93a0..3f624619df 100644
--- a/src/core/manager-serialize.c
+++ b/src/core/manager-serialize.c
@@ -92,7 +92,6 @@ int manager_serialize(
         (void) serialize_item_format(f, "current-job-id", "%" PRIu32, m->current_job_id);
         (void) serialize_item_format(f, "n-installed-jobs", "%u", m->n_installed_jobs);
         (void) serialize_item_format(f, "n-failed-jobs", "%u", m->n_failed_jobs);
-        (void) serialize_bool(f, "ready-sent", m->ready_sent);
         (void) serialize_bool(f, "taint-logged", m->taint_logged);
         (void) serialize_bool(f, "service-watchdogs", m->service_watchdogs);
 
@@ -356,15 +355,6 @@ int manager_deserialize(Manager *m, FILE *f, FDSet *fds) {
                         else
                                 m->n_failed_jobs += n;
 
-                } else if ((val = startswith(l, "ready-sent="))) {
-                        int b;
-
-                        b = parse_boolean(val);
-                        if (b < 0)
-                                log_notice("Failed to parse ready-sent flag '%s', ignoring.", val);
-                        else
-                                m->ready_sent = m->ready_sent || b;
-
                 } else if ((val = startswith(l, "taint-logged="))) {
                         int b;
 
@@ -558,7 +548,7 @@ int manager_deserialize(Manager *m, FILE *f, FDSet *fds) {
 
                         if (q < _MANAGER_TIMESTAMP_MAX) /* found it */
                                 (void) deserialize_dual_timestamp(val, m->timestamps + q);
-                        else if (!STARTSWITH_SET(l, "kdbus-fd=", "honor-device-enumeration=")) /* ignore deprecated values */
+                        else if (!STARTSWITH_SET(l, "kdbus-fd=", "honor-device-enumeration=", "ready-sent=")) /* ignore deprecated values */
                                 log_notice("Unknown serialization item '%s', ignoring.", l);
                 }
         }