diff --git a/env_support/rt-thread/lv_rt_thread_port.c b/env_support/rt-thread/lv_rt_thread_port.c
index 97027f08a..98a1439b5 100644
--- a/env_support/rt-thread/lv_rt_thread_port.c
+++ b/env_support/rt-thread/lv_rt_thread_port.c
@@ -31,7 +31,7 @@ extern void lv_port_indev_init(void);
 extern void lv_user_gui_init(void);
 
 static struct rt_thread lvgl_thread;
-static rt_uint8_t lvgl_thread_stack[PKG_LVGL_THREAD_STACK_SIZE];
+static ALIGN(8) rt_uint8_t lvgl_thread_stack[PKG_LVGL_THREAD_STACK_SIZE];
 
 #if LV_USE_LOG
 static void lv_rt_log(const char *buf)