diff --git a/bigbone/src/main/kotlin/social/bigbone/api/entity/MediaAttachment.kt b/bigbone/src/main/kotlin/social/bigbone/api/entity/MediaAttachment.kt
index 60ba2434..56dd62ac 100644
--- a/bigbone/src/main/kotlin/social/bigbone/api/entity/MediaAttachment.kt
+++ b/bigbone/src/main/kotlin/social/bigbone/api/entity/MediaAttachment.kt
@@ -139,13 +139,13 @@ data class MediaAttachment(
              * Width of this media attachment.
              */
             @SerialName("width")
-            val width: Int,
+            val width: Int? = null,
 
             /**
              * Height of this media attachment.
              */
             @SerialName("height")
-            val height: Int,
+            val height: Int? = null,
 
             /**
              * Size of this media attachment.
diff --git a/bigbone/src/test/assets/media_attachment_audio.json b/bigbone/src/test/assets/media_attachment_audio.json
new file mode 100644
index 00000000..290e6798
--- /dev/null
+++ b/bigbone/src/test/assets/media_attachment_audio.json
@@ -0,0 +1,21 @@
+{
+  "id": "21165404",
+  "type": "audio",
+  "url": "https://files.mastodon.social/media_attachments/files/021/165/404/original/a31a4a46cd713cd2.mp3",
+  "preview_url": "https://files.mastodon.social/media_attachments/files/021/165/404/small/a31a4a46cd713cd2.mp3",
+  "remote_url": null,
+  "text_url": "https://mastodon.social/media/5O4uILClVqBWx0NNgvo",
+  "meta": {
+    "length": "0:06:42.86",
+    "duration": 402.86,
+    "audio_encode": "mp3",
+    "audio_bitrate": "44100 Hz",
+    "audio_channels": "stereo",
+    "original": {
+      "duration": 402.860408,
+      "bitrate": 166290
+    }
+  },
+  "description": null,
+  "blurhash": null
+}
\ No newline at end of file
diff --git a/bigbone/src/test/kotlin/social/bigbone/api/entity/MediaAttachmentTest.kt b/bigbone/src/test/kotlin/social/bigbone/api/entity/MediaAttachmentTest.kt
index 57057674..8d130b72 100644
--- a/bigbone/src/test/kotlin/social/bigbone/api/entity/MediaAttachmentTest.kt
+++ b/bigbone/src/test/kotlin/social/bigbone/api/entity/MediaAttachmentTest.kt
@@ -17,4 +17,17 @@ class MediaAttachmentTest {
         mediaAttachment.previewUrl shouldBeEqualTo "preview"
         mediaAttachment.type shouldBeEqualTo MediaAttachment.MediaType.VIDEO
     }
+
+    @Test
+    fun deserializeAudio() {
+        val json = AssetsUtil.readFromAssets("media_attachment_audio.json")
+        val mediaAttachment: MediaAttachment = JSON_SERIALIZER.decodeFromString(json)
+        mediaAttachment.id shouldBeEqualTo "21165404"
+        mediaAttachment.url shouldBeEqualTo "https://files.mastodon.social/media_attachments/files/021/165/404/original/a31a4a46cd713cd2.mp3"
+        mediaAttachment.previewUrl shouldBeEqualTo "https://files.mastodon.social/media_attachments/files/021/165/404/small/a31a4a46cd713cd2.mp3"
+        mediaAttachment.type shouldBeEqualTo MediaAttachment.MediaType.AUDIO
+        mediaAttachment.meta?.length shouldBeEqualTo "0:06:42.86"
+        mediaAttachment.meta?.original?.width shouldBeEqualTo null
+        mediaAttachment.meta?.original?.height shouldBeEqualTo null
+    }
 }