diff --git a/src/core/impl/utils/thread.cpp b/src/core/impl/utils/thread.cpp
index b8104983..f6f72c24 100644
--- a/src/core/impl/utils/thread.cpp
+++ b/src/core/impl/utils/thread.cpp
@@ -18,6 +18,12 @@ using namespace mgb;
 #if MGB_THREAD_SAFE
 const std::thread::id RecursiveSpinlock::sm_none_owner = std::thread::id();
 
+//! why not use initializer_list for global var, detail:
+//! MGE-1738
+RecursiveSpinlock::RecursiveSpinlock() {
+    m_owner = sm_none_owner;
+}
+
 void RecursiveSpinlock::lock() {
     auto tid = std::this_thread::get_id();
     if (m_owner.load(std::memory_order_relaxed) != tid) {
diff --git a/src/core/include/megbrain/utils/thread_impl_spinlock.h b/src/core/include/megbrain/utils/thread_impl_spinlock.h
index 9cbafc27..b9f1efc4 100644
--- a/src/core/include/megbrain/utils/thread_impl_spinlock.h
+++ b/src/core/include/megbrain/utils/thread_impl_spinlock.h
@@ -33,15 +33,15 @@ class Spinlock final: public NonCopyableObj {
 };
 
 //! recursive spinlock
-class RecursiveSpinlock final: public NonCopyableObj {
+class RecursiveSpinlock final : public NonCopyableObj {
     static const std::thread::id sm_none_owner;
-    std::atomic<std::thread::id> m_owner{sm_none_owner};
+    std::atomic<std::thread::id> m_owner;
     size_t m_recur_count = 0;
 
-    public:
-
-        void lock();
-        void unlock();
+public:
+    RecursiveSpinlock();
+    void lock();
+    void unlock();
 };
 
 }  // namespace mgb