diff --git a/iot/wiznet/Kconfig b/iot/wiznet/Kconfig
index 502ff6bf9a..8ead96e11f 100644
--- a/iot/wiznet/Kconfig
+++ b/iot/wiznet/Kconfig
@@ -8,6 +8,7 @@ menuconfig PKG_USING_WIZNET
     select RT_USING_LIBC if RT_VER_NUM < 0x40100
     select RT_USING_SAL
     select RT_USING_TIMER_SOFT
+    select RT_USING_LEGACY
 
 if PKG_USING_WIZNET