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diff --git a/src/acos.c b/src/acos.c
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+++ b/src/acos.c
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+/* mpc_acos -- arccosine of a complex number.
+
+Copyright (C) 2009 Philippe Th\'eveny
+
+This file is part of the MPC Library.
+
+The MPC Library is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or (at your
+option) any later version.
+
+The MPC Library is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with the MPC Library; see the file COPYING.LIB.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+MA 02111-1307, USA. */
+
+#include "mpc-impl.h"
+
+int
+mpc_acos (mpc_ptr rop, mpc_srcptr op, mpc_rnd_t rnd)
+{
+  mpfr_set_nan (MPC_RE (rop));
+  mpfr_set_nan (MPC_RE (rop));
+  return 0;
+}