diff --git a/test/test_YoutubeDL.py b/test/test_YoutubeDL.py
index 2c30cb425..273f49666 100644
--- a/test/test_YoutubeDL.py
+++ b/test/test_YoutubeDL.py
@@ -522,7 +522,7 @@ class TestFormatSelection(unittest.TestCase):
             pass
         self.assertEqual(ydl.downloaded_info_dicts, [])
 
-    @patch('yt_dlp.YoutubeDL.FFmpegMergerPP.available', False)
+    @patch('yt_dlp.postprocessor.ffmpeg.FFmpegMergerPP.available', False)
     def test_default_format_spec_without_ffmpeg(self):
         ydl = YDL({})
         self.assertEqual(ydl._default_format_spec({}), 'best/bestvideo+bestaudio')
@@ -543,8 +543,8 @@ class TestFormatSelection(unittest.TestCase):
         self.assertEqual(ydl._default_format_spec({}), 'best/bestvideo+bestaudio')
         self.assertEqual(ydl._default_format_spec({'is_live': True}), 'best/bestvideo+bestaudio')
 
-    @patch('yt_dlp.YoutubeDL.FFmpegMergerPP.available', True)
-    @patch('yt_dlp.YoutubeDL.FFmpegMergerPP.can_merge', lambda _: True)
+    @patch('yt_dlp.postprocessor.ffmpeg.FFmpegMergerPP.available', True)
+    @patch('yt_dlp.postprocessor.ffmpeg.FFmpegMergerPP.can_merge', lambda _: True)
     def test_default_format_spec_with_ffmpeg(self):
         ydl = YDL({})
         self.assertEqual(ydl._default_format_spec({}), 'bestvideo*+bestaudio/best')