diff --git a/tests/test_audio.py b/tests/test_audio.py
index fa7be8b91..64e3f6a73 100644
--- a/tests/test_audio.py
+++ b/tests/test_audio.py
@@ -145,7 +145,6 @@ class AudioTest(BaseTest, unittest.TestCase):
         self.assertEqual(audio.performer, self.performer)
         self.assertEqual(audio.title, self.title)
         self.assertEqual(audio.mime_type, self.mime_type)
-        self.assertEqual(audio.file_size, self.file_size)
 
     def test_audio_de_json(self):
         """Test Audio.de_json() method"""
diff --git a/tests/test_document.py b/tests/test_document.py
index e606f568f..98711e768 100644
--- a/tests/test_document.py
+++ b/tests/test_document.py
@@ -112,7 +112,6 @@ class DocumentTest(BaseTest, unittest.TestCase):
         self.assertTrue(isinstance(document.thumb, telegram.PhotoSize))
         self.assertEqual(document.file_name, self.file_name)
         self.assertEqual(document.mime_type, self.mime_type)
-        self.assertEqual(document.file_size, self.file_size)
 
     def test_document_de_json(self):
         """Test Document.de_json() method"""
diff --git a/tests/test_video.py b/tests/test_video.py
index 1c2b230ac..654457e95 100644
--- a/tests/test_video.py
+++ b/tests/test_video.py
@@ -153,7 +153,6 @@ class VideoTest(BaseTest, unittest.TestCase):
         self.assertEqual(video.duration, 0)
         self.assertEqual(video.thumb, None)
         self.assertEqual(video.mime_type, '')
-        self.assertEqual(video.file_size, self.file_size)
 
         self.assertEqual(message.caption, self.caption)
 
diff --git a/tests/test_voice.py b/tests/test_voice.py
index 9418f1185..d08d9c983 100644
--- a/tests/test_voice.py
+++ b/tests/test_voice.py
@@ -123,7 +123,6 @@ class VoiceTest(BaseTest, unittest.TestCase):
         self.assertEqual(voice.file_id, self.voice_file_id)
         self.assertEqual(voice.duration, self.duration)
         self.assertEqual(voice.mime_type, self.mime_type)
-        self.assertEqual(voice.file_size, self.file_size)
 
     def test_voice_de_json(self):
         """Test Voice.de_json() method"""