diff --git a/src/core/main.c b/src/core/main.c
index f1dad983b72..70227da4b77 100644
--- a/src/core/main.c
+++ b/src/core/main.c
@@ -767,8 +767,10 @@ static void set_manager_defaults(Manager *m) {
         m->default_tasks_accounting = arg_default_tasks_accounting;
         m->default_tasks_max = arg_default_tasks_max;
 
-        manager_set_default_rlimits(m, arg_default_rlimit);
-        manager_transient_environment_add(m, arg_default_environment);
+        (void) manager_set_default_rlimits(m, arg_default_rlimit);
+
+        (void) manager_default_environment(m);
+        (void) manager_transient_environment_add(m, arg_default_environment);
 }
 
 static void set_manager_settings(Manager *m) {
diff --git a/src/core/manager.c b/src/core/manager.c
index 14be38600d2..f4fdd91c2c4 100644
--- a/src/core/manager.c
+++ b/src/core/manager.c
@@ -600,7 +600,7 @@ static char** sanitize_environment(char **l) {
         return l;
 }
 
-static int manager_default_environment(Manager *m) {
+int manager_default_environment(Manager *m) {
         assert(m);
 
         m->transient_environment = strv_free(m->transient_environment);
@@ -623,7 +623,7 @@ static int manager_default_environment(Manager *m) {
                 m->transient_environment = strv_copy(environ);
 
         if (!m->transient_environment)
-                return -ENOMEM;
+                return log_oom();
 
         sanitize_environment(m->transient_environment);
 
@@ -3875,7 +3875,7 @@ int manager_transient_environment_add(Manager *m, char **plus) {
 
         a = strv_env_merge(2, m->transient_environment, plus);
         if (!a)
-                return -ENOMEM;
+                return log_oom();
 
         sanitize_environment(a);
 
diff --git a/src/core/manager.h b/src/core/manager.h
index b65c4c8451f..f3ad44d26e2 100644
--- a/src/core/manager.h
+++ b/src/core/manager.h
@@ -442,6 +442,7 @@ void manager_clear_jobs(Manager *m);
 
 unsigned manager_dispatch_load_queue(Manager *m);
 
+int manager_default_environment(Manager *m);
 int manager_transient_environment_add(Manager *m, char **plus);
 int manager_client_environment_modify(Manager *m, char **minus, char **plus);
 int manager_get_effective_environment(Manager *m, char ***ret);