diff --git a/src/W800_SDK_v1.00.10/platform/sys/wm_main.c b/src/W800_SDK_v1.00.10/platform/sys/wm_main.c
index 1f3fe0d..17a4abb 100644
--- a/src/W800_SDK_v1.00.10/platform/sys/wm_main.c
+++ b/src/W800_SDK_v1.00.10/platform/sys/wm_main.c
@@ -95,7 +95,7 @@ void _mutex_release (u32 *mutex)
 u8 *TaskStartStk = NULL;
 tls_os_task_t tststarthdl = NULL;
 
-#define     TASK_USERMAIN_STK_SIZE         1024
+#define     TASK_USERMAIN_STK_SIZE         512
 u8 *TaskUsermainStk = NULL;
 tls_os_task_t tstusermainhdl = NULL;