diff --git a/src/server/master.cc b/src/server/master.cc
index a6d99b1e61..88bb944ebf 100644
--- a/src/server/master.cc
+++ b/src/server/master.cc
@@ -729,6 +729,7 @@ Server::Server(enum Mode _mode) {
     gs->max_concurrency = UINT_MAX;
 
     message_bus.set_id_generator([this]() { return sw_atomic_fetch_add(&gs->pipe_packet_msg_id, 1); });
+    worker_thread_start = [](const WorkerFn &fn) { fn(); };
 
     g_server_instance = this;
 }
diff --git a/src/server/thread.cc b/src/server/thread.cc
index 72e0014b75..00a10a36db 100644
--- a/src/server/thread.cc
+++ b/src/server/thread.cc
@@ -29,7 +29,6 @@ Factory *Server::create_thread_factory() {
     }
     reactor_threads = new ReactorThread[reactor_num]();
     reactor_pipe_num = 1;
-    worker_thread_start = [](const WorkerFn &fn) { fn(); };
     return new ThreadFactory(this);
 }