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diff --git a/gmp/mpq/set_si.c b/gmp/mpq/set_si.c
new file mode 100644
index 00000000..1bcf329c
--- /dev/null
+++ b/gmp/mpq/set_si.c
@@ -0,0 +1,54 @@
+/* mpq_set_si(dest,ulong_num,ulong_den) -- Set DEST to the retional number
+   ULONG_NUM/ULONG_DEN.
+
+Copyright 1991, 1994, 1995, 2001, 2003 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"
+
+void
+mpq_set_si (MP_RAT *dest, signed long int num, unsigned long int den)
+{
+  unsigned long int abs_num;
+
+  if (GMP_NUMB_BITS < BITS_PER_ULONG)
+    {
+      if (num == 0)  /* Canonicalize 0/d to 0/1.  */
+        den = 1;
+      mpz_set_si (mpq_numref (dest), num);
+      mpz_set_ui (mpq_denref (dest), den);
+      return;
+    }
+
+  abs_num = ABS (num);
+
+  if (num == 0)
+    {
+      /* Canonicalize 0/d to 0/1.  */
+      den = 1;
+      dest->_mp_num._mp_size = 0;
+    }
+  else
+    {
+      dest->_mp_num._mp_d[0] = abs_num;
+      dest->_mp_num._mp_size = num > 0 ? 1 : -1;
+    }
+
+  dest->_mp_den._mp_d[0] = den;
+  dest->_mp_den._mp_size = (den != 0);
+}