1 files changed, 1 insertions, 0 deletions
diff --git a/acos.c b/acos.c
index 74b95af54..932d359bd 100644
--- a/acos.c
+++ b/acos.c
@@ -57,6 +57,7 @@ mpfr_acos (mpfr_ptr acos, mpfr_srcptr x, mp_rnd_t rnd_mode)
 	}
       MPFR_ASSERTN(1);
     }
+  MPFR_CLEAR_FLAGS(x);
 
   /* Set x_p=|x| */
   signe = MPFR_SIGN(x);