1 files changed, 1 insertions, 1 deletions
diff --git a/acos.c b/acos.c
index 434a0fd26..ef47fa40b 100644
--- a/acos.c
+++ b/acos.c
@@ -23,7 +23,7 @@ http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
 #include "mpfr-impl.h"
 
 int
-mpfr_acos (mpfr_ptr acos, mpfr_srcptr x, mp_rnd_t rnd_mode)
+mpfr_acos (mpfr_ptr acos, mpfr_srcptr x, mpfr_rnd_t rnd_mode)
 {
   mpfr_t xp, arcc, tmp;
   mp_exp_t supplement;