diff --git a/os/zos_schduler.cpp b/os/zos_schduler.cpp
index 1ab5eaa..e799b78 100644
--- a/os/zos_schduler.cpp
+++ b/os/zos_schduler.cpp
@@ -11,7 +11,6 @@ void ZOSSchduler::regPeriodJob(function<void(Context& context)> job, uint32_t pe
 }
 
 void ZOSSchduler::loop() {
-  static uint32_t ticket = 0;
   Context         context;
   if (zos_haspassedms(ticket) < 1) {
     return;
diff --git a/os/zos_schduler.hpp b/os/zos_schduler.hpp
index a66a457..afbe3f3 100644
--- a/os/zos_schduler.hpp
+++ b/os/zos_schduler.hpp
@@ -48,6 +48,7 @@ class ZOSSchduler {
    *******************************************************************************/
   list<PeriodJob*> m_periodJobs;
   ZOSThread        m_thread;
+  uint32_t         ticket = 0;
 
  public:
   ZOSSchduler() {}
@@ -57,9 +58,8 @@ class ZOSSchduler {
   void regPeriodJob(function<void(Context& context)> job, uint32_t period_ms);
   void startSchedule(const char* threadname, int stack_size, osPriority priority);
 
-  private:
+ private:
   void loop();
-
 };
 
 // #define ZHAL_CORE_REG(period_ms, job) ZOSSchduler::getInstance()->regPeriodJob([this](ZOSSchduler::Context& context) { job }, period_ms);
diff --git a/os/zos_thread.hpp b/os/zos_thread.hpp
index 63ccbcb..37617ed 100644
--- a/os/zos_thread.hpp
+++ b/os/zos_thread.hpp
@@ -10,7 +10,7 @@ class ZOSThread {
   const char*      _threadname;
 
  public:
-  void init(const char* threadname, int stack_size = 512, osPriority priority = osPriorityNormal);
+  void init(const char* threadname, int stack_size = 1024,osPriority priority = osPriorityNormal);
   void run(function<void()> func);
 
  public: