diff --git a/VERSION b/VERSION
index d69e174d..91019d02 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-8.3.423
+8.3.424
diff --git a/readline/readline-4.3/mbutil.c b/readline/readline-4.3/mbutil.c
index 00066683..397c22a6 100644
--- a/readline/readline-4.3/mbutil.c
+++ b/readline/readline-4.3/mbutil.c
@@ -27,6 +27,7 @@
 
 #include <sys/types.h>
 #include <fcntl.h>
+#include <wchar.h>
 #include "posixjmp.h"
 
 #if defined (HAVE_UNISTD_H)