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diff --git a/gmp/mpz/get_si.c b/gmp/mpz/get_si.c
new file mode 100644
index 00000000..1308308f
--- /dev/null
+++ b/gmp/mpz/get_si.c
@@ -0,0 +1,43 @@
+/* mpz_get_si(integer) -- Return the least significant digit from INTEGER.
+
+Copyright 1991, 1993, 1994, 1995, 2000, 2001, 2002, 2006 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"
+
+signed long int
+mpz_get_si (mpz_srcptr z)
+{
+  mp_ptr zp = z->_mp_d;
+  mp_size_t size = z->_mp_size;
+  mp_limb_t zl = zp[0];
+
+#if GMP_NAIL_BITS != 0
+  if (ULONG_MAX > GMP_NUMB_MAX && ABS (size) >= 2)
+    zl |= zp[1] << GMP_NUMB_BITS;
+#endif
+
+  if (size > 0)
+    return (long) zl & LONG_MAX;
+  else if (size < 0)
+    /* This expression is necessary to properly handle 0x80000000 */
+    return ~(((long) zl - 1L) & LONG_MAX);
+  else
+    return 0;
+}