diff --git a/src/realtime/types.rs b/src/realtime/types.rs
index 0cc70d9..ba33448 100644
--- a/src/realtime/types.rs
+++ b/src/realtime/types.rs
@@ -38,9 +38,9 @@ pub enum RealtimeVoice {
 pub enum AudioFormat {
     #[serde(rename = "pcm16")]
     PCM16,
-    #[serde(rename = "g711-ulaw")]
+    #[serde(rename = "g711_ulaw")]
     G711ULAW,
-    #[serde(rename = "g711-alaw")]
+    #[serde(rename = "g711_alaw")]
     G711ALAW,
 }