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diff --git a/gmp/mpz/init2.c b/gmp/mpz/init2.c
new file mode 100644
index 00000000..6c271bde
--- /dev/null
+++ b/gmp/mpz/init2.c
@@ -0,0 +1,50 @@
+/* mpz_init2 -- initialize mpz, with requested size in bits.
+
+Copyright 2001, 2002, 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_init2 (mpz_ptr x, unsigned long bits)
+{
+  mp_size_t  new_alloc;
+
+  bits -= (bits != 0);		/* Round down, except if 0 */
+  new_alloc = 1 + bits / GMP_NUMB_BITS;
+
+  if (sizeof (unsigned long) > sizeof (int)) /* param vs _mp_size field */
+    {
+      if (UNLIKELY (new_alloc > INT_MAX))
+	{
+	  fprintf (stderr, "gmp: overflow in mpz type\n");
+	  abort ();
+	}
+    }
+
+  PTR(x) = __GMP_ALLOCATE_FUNC_LIMBS (new_alloc);
+  ALLOC(x) = new_alloc;
+  SIZ(x) = 0;
+
+#ifdef __CHECKER__
+  /* let the low limb look initialized, for the benefit of mpz_get_ui etc */
+  PTR(x)[0] = 0;
+#endif
+}