diff --git a/appl/ftp/ftpd/gss_userok.c b/appl/ftp/ftpd/gss_userok.c
index 8fa28f3fd..bd52873d8 100644
--- a/appl/ftp/ftpd/gss_userok.c
+++ b/appl/ftp/ftpd/gss_userok.c
@@ -88,7 +88,8 @@ gss_userok(void *app_data, char *username)
 	       goto fail;
 	   }
 
-           asprintf (&ticketfile, "%s%u", KRB5_DEFAULT_CCROOT, pw->pw_uid);
+           asprintf (&ticketfile, "%s%u", KRB5_DEFAULT_CCROOT,
+		     (unsigned)pw->pw_uid);
         
            ret = krb5_cc_resolve(gssapi_krb5_context, ticketfile, &ccache);
            if (ret)