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diff --git a/mpfr/get_uj.c b/mpfr/get_uj.c
new file mode 100644
index 00000000..5ecda557
--- /dev/null
+++ b/mpfr/get_uj.c
@@ -0,0 +1,95 @@
+/* mpfr_get_uj -- convert a MPFR number to a huge machine unsigned integer
+
+Copyright 2004, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+Contributed by the Arenaire and Cacao projects, INRIA.
+
+This file is part of the GNU MPFR Library.
+
+The GNU MPFR 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 GNU MPFR 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 GNU MPFR Library; see the file COPYING.LIB.  If not, write to
+the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+MA 02110-1301, USA. */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"       /* for a build within gmp */
+#endif
+
+/* The ISO C99 standard specifies that in C++ implementations the
+   INTMAX_MAX, ... macros should only be defined if explicitly requested.  */
+#if defined __cplusplus
+# define __STDC_LIMIT_MACROS
+# define __STDC_CONSTANT_MACROS
+#endif
+
+#if HAVE_INTTYPES_H
+# include <inttypes.h> /* for intmax_t */
+#else
+# if HAVE_STDINT_H
+#  include <stdint.h>
+# endif
+#endif
+
+#include "mpfr-impl.h"
+
+#ifdef _MPFR_H_HAVE_INTMAX_T
+
+uintmax_t
+mpfr_get_uj (mpfr_srcptr f, mpfr_rnd_t rnd)
+{
+  uintmax_t r;
+  mp_prec_t prec;
+  mpfr_t x;
+
+  if (!mpfr_fits_uintmax_p (f, rnd))
+    {
+      MPFR_SET_ERANGE ();
+      return MPFR_IS_NEG (f) ? (uintmax_t) 0 : UINTMAX_MAX;
+    }
+
+  if (MPFR_IS_ZERO (f))
+    return (uintmax_t) 0;
+
+  /* determine the precision of uintmax_t */
+  for (r = UINTMAX_MAX, prec = 0; r != 0; r /= 2, prec++)
+    { }
+
+  /* Now, r = 0. */
+
+  mpfr_init2 (x, prec);
+  mpfr_rint (x, f, rnd);
+  MPFR_ASSERTN (MPFR_IS_FP (x));
+
+  if (MPFR_NOTZERO (x))
+    {
+      mp_limb_t *xp;
+      int sh, n;  /* An int should be sufficient in this context. */
+
+      MPFR_ASSERTN (MPFR_IS_POS (x));
+      xp = MPFR_MANT (x);
+      sh = MPFR_GET_EXP (x);
+      MPFR_ASSERTN ((mp_prec_t) sh <= prec);
+      for (n = MPFR_LIMB_SIZE(x) - 1; n >= 0; n--)
+        {
+          sh -= BITS_PER_MP_LIMB;
+          r += (sh >= 0
+                ? (uintmax_t) xp[n] << sh
+                : (uintmax_t) xp[n] >> (- sh));
+        }
+    }
+
+  mpfr_clear (x);
+
+  return r;
+}
+
+#endif