diff --git a/env_support/rt-thread/lv_rt_thread_conf.h b/env_support/rt-thread/lv_rt_thread_conf.h
index 4cdf476fa..ab8edbfc7 100644
--- a/env_support/rt-thread/lv_rt_thread_conf.h
+++ b/env_support/rt-thread/lv_rt_thread_conf.h
@@ -53,8 +53,8 @@
 
 #define LV_SPRINTF_CUSTOM 1
 #define LV_SPRINTF_INCLUDE LV_RTTHREAD_INCLUDE
-#define lv_snprintf  rt_snprintf
-#define lv_vsnprintf rt_vsnprintf
+#define LV_SNPRINTF  rt_snprintf
+#define LV_VSNPRINTF rt_vsnprintf
 #define LV_SPRINTF_USE_FLOAT 0
 
 /*=====================