diff --git a/src/core/manager.c b/src/core/manager.c
index 61e233c8a8..656bdbb76d 100644
--- a/src/core/manager.c
+++ b/src/core/manager.c
@@ -1255,7 +1255,7 @@ Manager* manager_free(Manager *m) {
         return mfree(m);
 }
 
-void manager_enumerate(Manager *m) {
+static void manager_enumerate(Manager *m) {
         UnitType c;
 
         assert(m);
diff --git a/src/core/manager.h b/src/core/manager.h
index cab89d8192..35a3a1eb40 100644
--- a/src/core/manager.h
+++ b/src/core/manager.h
@@ -373,7 +373,6 @@ int manager_new(UnitFileScope scope, unsigned test_run_flags, Manager **m);
 Manager* manager_free(Manager *m);
 DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_free);
 
-void manager_enumerate(Manager *m);
 int manager_startup(Manager *m, FILE *serialization, FDSet *fds);
 
 Job *manager_get_job(Manager *m, uint32_t id);