diff --git a/experiments/Lavalink4NET.Experiments.Receive/Connections/Payloads/SessionDescriptionPayload.cs b/experiments/Lavalink4NET.Experiments.Receive/Connections/Payloads/SessionDescriptionPayload.cs
index d54cef8f..1c6422e1 100644
--- a/experiments/Lavalink4NET.Experiments.Receive/Connections/Payloads/SessionDescriptionPayload.cs
+++ b/experiments/Lavalink4NET.Experiments.Receive/Connections/Payloads/SessionDescriptionPayload.cs
@@ -9,6 +9,10 @@ internal sealed record class SessionDescriptionPayload : IVoicePayload
     [JsonPropertyName("mode")]
     public required string Mode { get; set; }
 
+    [JsonRequired]
+    [JsonPropertyName("audio_codec")]
+    public required string AudioCodec { get; set; }
+
     [JsonRequired]
     [JsonPropertyName("secret_key")]
     [JsonConverter(typeof(SecretKeyJsonConverter))]