diff -urNp current/lib/libc/posix1e/acl_entry.c nfs4acl/lib/libc/posix1e/acl_entry.c
--- current/lib/libc/posix1e/acl_entry.c	2009-05-23 07:49:39.000000000 +0200
+++ nfs4acl/lib/libc/posix1e/acl_entry.c	2009-05-23 08:37:49.000000000 +0200
@@ -51,7 +51,7 @@ acl_create_entry(acl_t *acl_p, acl_entry
 
 	acl_int = &(*acl_p)->ats_acl;
 
-	if ((acl_int->acl_cnt >= ACL_MAX_ENTRIES) || (acl_int->acl_cnt < 0)) {
+	if ((acl_int->acl_cnt + 1 >= ACL_MAX_ENTRIES) || (acl_int->acl_cnt < 0)) {
 		errno = EINVAL;
 		return (-1);
 	}