diff --git a/src/lib/libc/string/wcsdup.3 b/src/lib/libc/string/wcsdup.3
index 4d29ac21..6588f149 100644
--- a/src/lib/libc/string/wcsdup.3
+++ b/src/lib/libc/string/wcsdup.3
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: wcsdup.3,v 1.2 2011/07/05 19:01:31 nicm Exp $
+.\"	$OpenBSD: wcsdup.3,v 1.3 2011/07/08 17:46:45 nicm Exp $
 .\"	$NetBSD: wcsdup.3,v 1.3 2010/12/16 17:42:28 wiz Exp $
 .\"
 .\" Copyright (c) 1990, 1991, 1993
@@ -30,7 +30,7 @@
 .\"
 .\"     from: @(#)strdup.3	8.1 (Berkeley) 6/9/93
 .\"
-.Dd $Mdocdate: July 5 2011 $
+.Dd $Mdocdate: July 8 2011 $
 .Dt WCSDUP 3
 .Os
 .Sh NAME
@@ -61,9 +61,17 @@ The following will point
 to an allocated area of memory containing the nul-terminated string
 .Qq foobar :
 .Bd -literal -offset indent
-wchar_t *p;
+const char	*o = "foobar";
+wchar_t		*p, b[32];
+size_t		 blen;
 
-if ((p = wcsdup(L"foobar")) == NULL) {
+blen = sizeof(b) / sizeof(b[0]);
+if (mbstowcs(b, o, blen) == (size_t)-1) {
+	fprintf(stderr, "Failed to convert string.\en");
+	exit(1);
+}
+b[blen - 1] = 0;
+if ((p = wcsdup(b)) == NULL) {
 	fprintf(stderr, "Out of memory.\en");
 	exit(1);
 }