diff --git a/ChangeLog b/ChangeLog
index 6d1c8ffd08..9cb7b6102b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+1999-06-22  Andreas Jaeger  <aj@arthur.rhein-neckar.de>
+
+	* libio/wscanf.c: Include <wchar.h> for prototype.
+
 1999-06-22  Ulrich Drepper  <drepper@cygnus.com>
 
 	* manual/io.texi. Fix typos.
diff --git a/libio/wscanf.c b/libio/wscanf.c
index a530d6fcfa..dcae69aa67 100644
--- a/libio/wscanf.c
+++ b/libio/wscanf.c
@@ -18,6 +18,7 @@
 
 #include <stdarg.h>
 #include <stdio.h>
+#include <wchar.h>
 
 
 /* Read formatted input from stdin according to the format string FORMAT.  */