diff --git a/eventlet/green/select.py b/eventlet/green/select.py
index f1bf381..53fb359 100644
--- a/eventlet/green/select.py
+++ b/eventlet/green/select.py
@@ -17,12 +17,12 @@ def get_fileno(obj):
         f = obj.fileno
     except AttributeError:
         if not isinstance(obj, six.integer_types):
-            raise TypeError("Expected int or long, got " + type(obj))
+            raise TypeError("Expected int or long, got %s" % type(obj))
         return obj
     else:
         rv = f()
         if not isinstance(rv, six.integer_types):
-            raise TypeError("Expected int or long, got " + type(rv))
+            raise TypeError("Expected int or long, got %s" % type(rv))
         return rv
 
 
diff --git a/tests/greenio_test.py b/tests/greenio_test.py
index e05a524..4b375ba 100644
--- a/tests/greenio_test.py
+++ b/tests/greenio_test.py
@@ -613,6 +613,38 @@ class TestGreenSocket(LimitedTestCase):
         assert select.select([], [s1], [], 0) == ([], [s1], [])
 
 
+def test_get_fileno_of_a_socket_works():
+    class DummySocket(object):
+        def fileno(self):
+            return 123
+    assert select.get_fileno(DummySocket()) == 123
+
+
+def test_get_fileno_of_an_int_works():
+    assert select.get_fileno(123) == 123
+
+
+def test_get_fileno_of_wrong_type_fails():
+    try:
+        select.get_fileno('foo')
+    except TypeError as ex:
+        assert str(ex) == 'Expected int or long, got <type \'str\'>'
+    else:
+        assert False, 'Expected TypeError not raised'
+
+
+def test_get_fileno_of_a_socket_with_fileno_returning_wrong_type_fails():
+    class DummySocket(object):
+        def fileno(self):
+            return 'foo'
+    try:
+        select.get_fileno(DummySocket())
+    except TypeError as ex:
+        assert str(ex) == 'Expected int or long, got <type \'str\'>'
+    else:
+        assert False, 'Expected TypeError not raised'
+
+
 class TestGreenPipe(LimitedTestCase):
     @skip_on_windows
     def setUp(self):