Index: Python/random.c
===================================================================
--- Python/random.c.orig
+++ Python/random.c
@@ -165,7 +165,7 @@ dev_urandom_python(char *buffer, Py_ssiz
     Py_END_ALLOW_THREADS
     if (fd < 0)
     {
-        PyErr_SetFromErrnoWithFilename(PyExc_OSError, "/dev/urandom");
+        PyErr_SetFromErrnoWithFilename(PyExc_NotImplementedError, "/dev/urandom");
         return -1;
     }