diff --git a/speech_recognition/__init__.py b/speech_recognition/__init__.py
index 37d5f49e..2169ae57 100644
--- a/speech_recognition/__init__.py
+++ b/speech_recognition/__init__.py
@@ -21,7 +21,7 @@
 import uuid
 
 __author__ = "Anthony Zhang (Uberi)"
-__version__ = "3.6.4"
+__version__ = "3.6.5"
 __license__ = "BSD"
 
 try:  # attempt to use the Python 2 modules
@@ -1105,7 +1105,7 @@ def __enter__(self):
         # create the temporary file and open it
         import tempfile
         file_descriptor, file_path = tempfile.mkstemp()
-        self._file = open(file_descriptor, self.mode)
+        self._file = os.fdopen(file_descriptor, self.mode)
 
         # the name property is a public field
         self.name = file_path
diff --git a/tests/test_special_features.py b/tests/test_special_features.py
new file mode 100644
index 00000000..c77ab44a
--- /dev/null
+++ b/tests/test_special_features.py
@@ -0,0 +1,23 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+import os
+import unittest
+
+import speech_recognition as sr
+
+
+class TestSpecialFeatures(unittest.TestCase):
+    def setUp(self):
+        self.AUDIO_FILE_EN = os.path.join(os.path.dirname(os.path.realpath(__file__)), "english.wav")
+
+    def test_sphinx_keywords(self):
+        r = sr.Recognizer()
+        with sr.AudioFile(self.AUDIO_FILE_EN) as source: audio = r.record(source)
+        self.assertEqual(r.recognize_sphinx(audio, keyword_entries=[("one", 1.0), ("two", 1.0), ("three", 1.0)]), "three  two  two  one ")
+        self.assertEqual(r.recognize_sphinx(audio, keyword_entries=[("wan", 0.95), ("too", 1.0), ("tree", 1.0)]), "tree  too  wan  too  wan ")
+        self.assertEqual(r.recognize_sphinx(audio, keyword_entries=[("un", 0.95), ("to", 1.0), ("tee", 1.0)]), "tee  to  un  to  un  un  un ")
+
+
+if __name__ == "__main__":
+    unittest.main()