--- sub.c.orig	Tue Dec 17 12:59:12 2002
+++ sub.c	Tue Dec 17 12:59:19 2002
@@ -100,7 +100,7 @@
           inexact = mpfr_add1(a, c, b, rnd_mode,
                               (mp_exp_unsigned_t) MPFR_EXP(c) - MPFR_EXP(b));
           MPFR_CHANGE_SIGN(a);
-          return inexact;
+          return -inexact;
         }
       else
         {