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diff --git a/mpfr/tests/tswap.c b/mpfr/tests/tswap.c
new file mode 100644
index 00000000..ee19e524
--- /dev/null
+++ b/mpfr/tests/tswap.c
@@ -0,0 +1,51 @@
+/* Test file for mpfr_swap.
+
+Copyright 2000, 2001, 2002, 2003, 2004, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+Contributed by the Arenaire and Cacao projects, INRIA.
+
+This file is part of the GNU MPFR Library.
+
+The GNU MPFR 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 MPFR 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 MPFR Library; see the file COPYING.LIB.  If not, write to
+the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+MA 02110-1301, USA. */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "mpfr-test.h"
+
+int
+main (void)
+{
+  mpfr_t u, v;
+
+  tests_start_mpfr ();
+
+  mpfr_init2 (u, 24);
+  mpfr_init2 (v, 53);
+  mpfr_set_ui (u, 16777215, GMP_RNDN); /* 2^24 - 1 */
+  mpfr_set_str1 (v, "9007199254740991.0"); /* 2^53 - 1 */
+  mpfr_swap (u, v);
+  mpfr_swap (u, v);
+  if (mpfr_cmp_ui (u, 16777215) || mpfr_cmp_str1 (v, "9007199254740991.0"))
+    {
+      printf ("Error in mpfr_swap\n");
+      exit (1);
+    }
+  mpfr_clear (u);
+  mpfr_clear (v);
+
+  tests_end_mpfr ();
+  return 0;
+}