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diff --git a/gmp/mpz/realloc.c b/gmp/mpz/realloc.c
new file mode 100644
index 00000000..0a6d1638
--- /dev/null
+++ b/gmp/mpz/realloc.c
@@ -0,0 +1,61 @@
+/* _mpz_realloc -- make the mpz_t have NEW_ALLOC digits allocated.
+
+Copyright 1991, 1993, 1994, 1995, 2000, 2001, 2008 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 <stdlib.h>
+#include <stdio.h>
+#include "gmp.h"
+#include "gmp-impl.h"
+
+void *
+_mpz_realloc (mpz_ptr m, mp_size_t new_alloc)
+{
+  mp_ptr mp;
+
+  /* Never allocate zero space. */
+  new_alloc = MAX (new_alloc, 1);
+
+  if (sizeof (mp_size_t) == sizeof (int))
+    {
+      if (UNLIKELY (new_alloc > ULONG_MAX / GMP_NUMB_BITS))
+	{
+	  fprintf (stderr, "gmp: overflow in mpz type\n");
+	  abort ();
+	}
+    }
+  else
+    {
+      if (UNLIKELY (new_alloc > INT_MAX))
+	{
+	  fprintf (stderr, "gmp: overflow in mpz type\n");
+	  abort ();
+	}
+    }
+
+  mp = __GMP_REALLOCATE_FUNC_LIMBS (PTR(m), ALLOC(m), new_alloc);
+  PTR(m) = mp;
+  ALLOC(m) = new_alloc;
+
+  /* Don't create an invalid number; if the current value doesn't fit after
+     reallocation, clear it to 0.  */
+  if (ABSIZ(m) > new_alloc)
+    SIZ(m) = 0;
+
+  return (void *) mp;
+}