diff --git a/tests/assets/README.md b/tests/assets/README.md
index dd40765..8ee4ca5 100644
--- a/tests/assets/README.md
+++ b/tests/assets/README.md
@@ -15,6 +15,12 @@ Kevin MacLeod (incompetech.com),
 licensed under Creative Commons:
 [CC-BY-3.0](http://creativecommons.org/licenses/by/3.0/).
 
+We converted the file `gs-16b-1c-44100hz.opus`
+to `gs-16b-1c-16000hz.opus` using
+```bash
+ffmpeg -y -i gs-16b-1c-44100hz.opus -ac 1 -ar 16000 gs-16b-1c-16000hz-fixed.opus
+```
+
 ## Video test files
 
 The folder contains the video file `video.mp4`,
diff --git a/tests/assets/gs-16b-1c-16000hz.opus b/tests/assets/gs-16b-1c-16000hz.opus
new file mode 100644
index 0000000..2016986
Binary files /dev/null and b/tests/assets/gs-16b-1c-16000hz.opus differ
diff --git a/tests/assets/gs-16b-1c-44100hz.opus b/tests/assets/gs-16b-1c-44100hz.opus
deleted file mode 100644
index 40a1e11..0000000
Binary files a/tests/assets/gs-16b-1c-44100hz.opus and /dev/null differ
diff --git a/tests/test_audiofile.py b/tests/test_audiofile.py
index 383f274..50f59e0 100644
--- a/tests/test_audiofile.py
+++ b/tests/test_audiofile.py
@@ -512,7 +512,7 @@ def test_file_type(tmpdir, file_type, magnitude, sampling_rate, channels):
 @pytest.mark.parametrize(
     "file, header_duration, audio, video",  # header duration as given by mediainfo
     [
-        ("gs-16b-1c-44100hz.opus", 15.839, True, False),
+        ("gs-16b-1c-16000hz.opus", 15.839, True, False),
         ("gs-16b-1c-8000hz.amr", 15.840000, True, False),
         ("gs-16b-1c-44100hz.m4a", 15.833, True, False),
         ("gs-16b-1c-44100hz.aac", None, True, False),