diff --git a/src/Runtime/mbstring.c b/src/Runtime/mbstring.c
index a7819ee3..9e95ff13 100644
--- a/src/Runtime/mbstring.c
+++ b/src/Runtime/mbstring.c
@@ -1,7 +1,6 @@
 #include "errno.h"
 #include "stdio.h"
 #include "string.h"
-#include "wstring.h"
 
 #pragma ANSI_strict off