diff --git a/Lib/test/test_time.py b/Lib/test/test_time.py
index 9d7dbc8..94de098 100644
--- a/Lib/test/test_time.py
+++ b/Lib/test/test_time.py
@@ -27,6 +27,8 @@
                          int(self.t))
 
     def test_sleep(self):
+        self.assertRaises(ValueError, time.sleep, -2)
+        self.assertRaises(ValueError, time.sleep, -1)
         time.sleep(1.2)
 
     def test_strftime(self):
diff --git a/Misc/NEWS b/Misc/NEWS
index 4f41fb1..b96ca50 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -219,6 +219,10 @@
 Library
 -------
 
+- Issue #12459: time.sleep() now raises a ValueError if the sleep length is
+  negative, instead of an infinite sleep on Windows or raising an IOError on
+  Linux for example, to have the same behaviour on all platforms.
+
 - Issue #12451: pydoc: html_getfile() now uses tokenize.open() to support
   Python scripts using a encoding different than UTF-8 (read the coding cookie
   of the script).
diff --git a/Modules/timemodule.c b/Modules/timemodule.c
index 636d4ad..4dc82a0 100644
--- a/Modules/timemodule.c
+++ b/Modules/timemodule.c
@@ -141,6 +141,11 @@
     double secs;
     if (!PyArg_ParseTuple(args, "d:sleep", &secs))
         return NULL;
+    if (secs < 0) {
+        PyErr_SetString(PyExc_ValueError,
+                        "sleep length must be non-negative");
+        return NULL;
+    }
     if (floatsleep(secs) != 0)
         return NULL;
     Py_INCREF(Py_None);