diff --git a/server/tests/test_transcripts_audio_download.py b/server/tests/test_transcripts_audio_download.py
index f37b7a4f..79cb25bf 100644
--- a/server/tests/test_transcripts_audio_download.py
+++ b/server/tests/test_transcripts_audio_download.py
@@ -35,7 +35,7 @@ async def fake_transcript(tmpdir):
 @pytest.mark.parametrize(
     "url_suffix,content_type",
     [
-        ["/mp3", "audio/mp3"],
+        ["/mp3", "audio/mpeg"],
     ],
 )
 async def test_transcript_audio_download(fake_transcript, url_suffix, content_type):
@@ -51,7 +51,7 @@ async def test_transcript_audio_download(fake_transcript, url_suffix, content_ty
 @pytest.mark.parametrize(
     "url_suffix,content_type",
     [
-        ["/mp3", "audio/mp3"],
+        ["/mp3", "audio/mpeg"],
     ],
 )
 async def test_transcript_audio_download_range(
@@ -74,7 +74,7 @@ async def test_transcript_audio_download_range(
 @pytest.mark.parametrize(
     "url_suffix,content_type",
     [
-        ["/mp3", "audio/mp3"],
+        ["/mp3", "audio/mpeg"],
     ],
 )
 async def test_transcript_audio_download_range_with_seek(
diff --git a/server/tests/test_transcripts_rtc_ws.py b/server/tests/test_transcripts_rtc_ws.py
index 2485ca6b..494fcd36 100644
--- a/server/tests/test_transcripts_rtc_ws.py
+++ b/server/tests/test_transcripts_rtc_ws.py
@@ -167,7 +167,7 @@ async def test_transcript_rtc_and_websocket(
     # check that audio/mp3 is available
     resp = await ac.get(f"/transcripts/{tid}/audio/mp3")
     assert resp.status_code == 200
-    assert resp.headers["Content-Type"] == "audio/mp3"
+    assert resp.headers["Content-Type"] == "audio/mpeg"
 
     # stop server
     server.stop()