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diff --git a/m4/sleep.m4 b/m4/sleep.m4
index 2c9d75cd..474ba07b 100644
--- a/m4/sleep.m4
+++ b/m4/sleep.m4
@@ -1,5 +1,5 @@
-# sleep.m4 serial 1
-dnl Copyright (C) 2007 Free Software Foundation, Inc.
+# sleep.m4 serial 2
+dnl Copyright (C) 2007-2008 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -7,8 +7,13 @@ dnl with or without modifications, as long as this notice is preserved.
 AC_DEFUN([gl_FUNC_SLEEP],
 [
   AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
-  AC_CHECK_FUNCS_ONCE([sleep])
-  if test $ac_cv_func_sleep = no; then
+  dnl We expect to see the declaration of sleep() in a header file.
+  dnl Older versions of mingw have a sleep() function that is an alias to
+  dnl _sleep() in MSVCRT. It has a different signature than POSIX sleep():
+  dnl it takes the number of milliseconds as argument and returns void.
+  dnl mingw does not declare this function.
+  AC_CHECK_DECLS([sleep], , , [#include <unistd.h>])
+  if test $ac_cv_have_decl_sleep != yes; then
     HAVE_SLEEP=0
     AC_LIBOBJ([sleep])
     gl_PREREQ_SLEEP