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diff --git a/gmp/randbui.c b/gmp/randbui.c
new file mode 100644
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--- /dev/null
+++ b/gmp/randbui.c
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+/* gmp_urandomb_ui -- random bits returned in a ulong.
+
+Copyright 2003, 2004 Free Software Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP 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 3 of the License, or (at your
+option) any later version.
+
+The GNU MP 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 MP Library.  If not, see http://www.gnu.org/licenses/.  */
+
+#include "gmp.h"
+#include "gmp-impl.h"
+
+
+/* Currently bits>=BITS_PER_ULONG is quietly truncated to BITS_PER_ULONG,
+   maybe this should raise an exception or something.  */
+
+unsigned long
+gmp_urandomb_ui (gmp_randstate_ptr rstate, unsigned long bits)
+{
+  mp_limb_t  a[LIMBS_PER_ULONG];
+
+  /* start with zeros, since if bits==0 then _gmp_rand will store nothing at
+     all, or if bits <= GMP_NUMB_BITS then it will store only a[0] */
+  a[0] = 0;
+#if LIMBS_PER_ULONG > 1
+  a[1] = 0;
+#endif
+
+  _gmp_rand (a, rstate, MIN (bits, BITS_PER_ULONG));
+
+#if LIMBS_PER_ULONG == 1
+  return a[0];
+#else
+  return a[0] | (a[1] << GMP_NUMB_BITS);
+#endif
+}