diff --git a/test/README.md b/test/README.md
index 7ac13c4169..304bfa9c8e 100644
--- a/test/README.md
+++ b/test/README.md
@@ -85,7 +85,7 @@ Files:
 
 Files:
 
-* `CommonVoice/cv-corpus-4-2019-12-10/tt/clips/common_voice_tt_00000000.mp3`
+* `CommonVoice/cv-corpus-4-2019-12-10/tt/clips/common_voice_tt_00000000.wav`
 * `LibriSpeech/dev-clean/1272/128104/1272-128104-0000.flac`
 * `LJSpeech-1.1/wavs/LJ001-0001.wav`
 * `SpeechCommands/speech_commands_v0.02/go/0a9f9af7_nohash_0.wav`
diff --git a/test/assets/CommonVoice/cv-corpus-4-2019-12-10/tt/clips/common_voice_tt_00000000.mp3 b/test/assets/CommonVoice/cv-corpus-4-2019-12-10/tt/clips/common_voice_tt_00000000.mp3
deleted file mode 100644
index d6fe9f44b9..0000000000
Binary files a/test/assets/CommonVoice/cv-corpus-4-2019-12-10/tt/clips/common_voice_tt_00000000.mp3 and /dev/null differ
diff --git a/test/assets/CommonVoice/cv-corpus-4-2019-12-10/tt/clips/common_voice_tt_00000000.wav b/test/assets/CommonVoice/cv-corpus-4-2019-12-10/tt/clips/common_voice_tt_00000000.wav
new file mode 100644
index 0000000000..8f9d80d7e1
Binary files /dev/null and b/test/assets/CommonVoice/cv-corpus-4-2019-12-10/tt/clips/common_voice_tt_00000000.wav differ
diff --git a/test/assets/CommonVoice/cv-corpus-4-2019-12-10/tt/train.tsv b/test/assets/CommonVoice/cv-corpus-4-2019-12-10/tt/train.tsv
index 2b677dbf7f..a5244b01f2 100644
--- a/test/assets/CommonVoice/cv-corpus-4-2019-12-10/tt/train.tsv
+++ b/test/assets/CommonVoice/cv-corpus-4-2019-12-10/tt/train.tsv
@@ -1,3 +1,3 @@
 client_id	path	sentence	up_votes	down_votes	age	gender	accent
-00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000	common_voice_tt_00000000.mp3	test.	1	0	thirties	female	
-00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001	common_voice_tt_00000000.mp3	test.	1	0	thirties	female	
+00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000	common_voice_tt_00000000.wav	test.	1	0	thirties	female	
+00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001	common_voice_tt_00000000.wav	test.	1	0	thirties	female	
diff --git a/test/assets/dtmf_30s_stereo.mp3 b/test/assets/dtmf_30s_stereo.mp3
deleted file mode 100644
index 6c97835ec0..0000000000
Binary files a/test/assets/dtmf_30s_stereo.mp3 and /dev/null differ