diff --git a/os/ticket.cpp b/os/ticket.cpp
index 4ec5197..f020c9c 100644
--- a/os/ticket.cpp
+++ b/os/ticket.cpp
@@ -2,11 +2,11 @@
 
 extern "C" {
 uint32_t zos_get_tick(void) {
-#ifdef IFLYTOP_ENABLE_OS
-  return osKernelSysTick();
-#else
+  // #ifdef IFLYTOP_ENABLE_OS
+  //   return osKernelSysTick();
+  // #else
   return HAL_GetTick();
-#endif
+  // #endif
 }
 uint32_t zos_haspassedms2(uint32_t lastticket, uint32_t nowticket) {
   if (nowticket >= lastticket) {