diff --git a/paramiko/osrandom.py b/paramiko/osrandom.py
index 47c8f44..ca2a0bc 100644
--- a/paramiko/osrandom.py
+++ b/paramiko/osrandom.py
@@ -44,7 +44,7 @@ if osrandom_source is None:
     try:
         _dev_urandom = open("/dev/urandom", "rb", 0)
         def urandom(bytes):
-            return _def_urandom.read(bytes)
+            return _dev_urandom.read(bytes)
         osrandom_source = "/dev/urandom"
     except (OSError, IOError):
         pass
diff --git a/tests/test_util.py b/tests/test_util.py
index 2cf5782..05fcc67 100644
--- a/tests/test_util.py
+++ b/tests/test_util.py
@@ -142,3 +142,9 @@ class UtilTest (unittest.TestCase):
         finally:
             os.unlink('hostfile.temp')
 
+    def test_6_random(self):
+        from paramiko.common import randpool
+        # just verify that we can pull out 32 bytes and not get an exception.
+        x = randpool.get_bytes(32)
+        self.assertEquals(len(x), 32)
+