diff --git a/tests/data/telegram.mp3 b/tests/data/telegram.mp3
index 2c9ea84d1..4b158d2ba 100644
Binary files a/tests/data/telegram.mp3 and b/tests/data/telegram.mp3 differ
diff --git a/tests/test_audio.py b/tests/test_audio.py
index a0325a8d2..0857144c7 100644
--- a/tests/test_audio.py
+++ b/tests/test_audio.py
@@ -69,7 +69,7 @@ class AudioTest(BaseTest, unittest.TestCase):
         self.assertEqual(self.audio.performer, None)
         self.assertEqual(self.audio.title, None)
         self.assertEqual(self.audio.mime_type, 'audio/mpeg')
-        self.assertEqual(self.audio.file_size, 28232)
+        self.assertEqual(self.audio.file_size, 122920)
 
     @flaky(3, 1)
     @timeout(10)
@@ -106,10 +106,7 @@ class AudioTest(BaseTest, unittest.TestCase):
         self.assertIsInstance(audio, telegram.Audio)
         self.assertIsInstance(audio.file_id, str)
         self.assertNotEqual(audio.file_id, None)
-        # For some reason duration on same file is different from web.
-        # hardcoding duration. Uncomment next line when fixed
-        # self.assertEqual(audio.duration, self.audio.duration)
-        self.assertEqual(audio.duration, 4)
+        self.assertEqual(audio.duration, self.audio.duration)
         self.assertEqual(audio.mime_type, self.audio.mime_type)
         self.assertEqual(audio.file_size, self.audio.file_size)
 
@@ -128,10 +125,7 @@ class AudioTest(BaseTest, unittest.TestCase):
         self.assertIsInstance(audio, telegram.Audio)
         self.assertIsInstance(audio.file_id, str)
         self.assertNotEqual(audio.file_id, None)
-        # For some reason duration on same file is different from web.
-        # hardcoding duration. Uncomment next line when fixed
-        # self.assertEqual(audio.duration, self.audio.duration)
-        self.assertEqual(audio.duration, 4)
+        self.assertEqual(audio.duration, self.audio.duration)
         self.assertEqual(audio.mime_type, self.audio.mime_type)
         self.assertEqual(audio.file_size, self.audio.file_size)