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diff --git a/rts/gmp/mpz/mul_siui.c b/rts/gmp/mpz/mul_siui.c
new file mode 100644
index 0000000..9849cd4
--- /dev/null
+++ b/rts/gmp/mpz/mul_siui.c
@@ -0,0 +1,81 @@
+/* mpz_mul_ui/si (product, multiplier, small_multiplicand) -- Set PRODUCT to
+   MULTIPLICATOR times SMALL_MULTIPLICAND.
+
+Copyright (C) 1991, 1993, 1994, 1996, 2000 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 2.1 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; see the file COPYING.LIB.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+MA 02111-1307, USA. */
+
+#include "gmp.h"
+#include "gmp-impl.h"
+
+
+#ifdef OPERATION_mul_ui
+#define FUNCTION              mpz_mul_ui
+#define MULTIPLICAND_UNSIGNED unsigned
+#define MULTIPLICAND_ABS(x)   x
+#else
+#ifdef OPERATION_mul_si
+#define FUNCTION              mpz_mul_si
+#define MULTIPLICAND_UNSIGNED
+#define MULTIPLICAND_ABS(x)   ABS(x)
+#else
+Error, error, unrecognised OPERATION
+#endif
+#endif
+
+
+void
+#if __STDC__
+FUNCTION (mpz_ptr prod, mpz_srcptr mult,
+          MULTIPLICAND_UNSIGNED long int small_mult)
+#else
+FUNCTION (prod, mult, small_mult)
+     mpz_ptr prod;
+     mpz_srcptr mult;
+     MULTIPLICAND_UNSIGNED long int small_mult;
+#endif
+{
+  mp_size_t size = mult->_mp_size;
+  mp_size_t sign_product = size;
+  mp_limb_t cy;
+  mp_size_t prod_size;
+  mp_ptr prod_ptr;
+
+  if (size == 0 || small_mult == 0)
+    {
+      prod->_mp_size = 0;
+      return;
+    }
+  size = ABS (size);
+
+  prod_size = size + 1;
+  if (prod->_mp_alloc < prod_size)
+    _mpz_realloc (prod, prod_size);
+
+  prod_ptr = prod->_mp_d;
+
+  cy = mpn_mul_1 (prod_ptr, mult->_mp_d, size,
+                  (mp_limb_t) MULTIPLICAND_ABS (small_mult));
+  if (cy != 0)
+    {
+      prod_ptr[size] = cy;
+      size++;
+    }
+
+  prod->_mp_size = ((sign_product < 0) ^ (small_mult < 0)) ? -size : size;
+}