diff --git a/src/audio_query.rs b/src/audio_query.rs
index 765a9d9..0f43b7e 100644
--- a/src/audio_query.rs
+++ b/src/audio_query.rs
@@ -16,7 +16,7 @@ impl AudioQuery {
     }
 
     pub async fn synthesis(&self, speaker: i32) -> Result<Bytes> {
-        let data = self.restapi.synthesis(&self.audio_query, speaker).await?;
+        let data = self.restapi.synthesis(&self.audio_query, speaker.to_string().as_str()).await?;
         Ok(data)
     }
 }
diff --git a/src/client.rs b/src/client.rs
index 27cbe77..2f805fd 100644
--- a/src/client.rs
+++ b/src/client.rs
@@ -14,10 +14,10 @@ impl Client {
 
     pub async fn create_audio_query(
         &self,
-        text: &str,
+        text: &str, speaker: i32,
         core_version: Option<&str>,
     ) -> Result<AudioQuery> {
-        let data: AudioQueryType = self.restapi.create_audio_query(text, core_version).await?;
+        let data: AudioQueryType = self.restapi.create_audio_query(text, speaker, core_version).await?;
         let audio_query = AudioQuery::new(self.restapi.clone(), data);
         Ok(audio_query)
     }
diff --git a/src/restapi.rs b/src/restapi.rs
index e1bf152..b003567 100644
--- a/src/restapi.rs
+++ b/src/restapi.rs
@@ -24,8 +24,8 @@ impl RestAPI {
     }
 
     pub async fn create_audio_query(
-        &self, speaker: i32,
-        text: &str,
+        &self,
+        text: &str, speaker: &str,
         core_version: Option<&str>,
     ) -> Result<AudioQueryType> {
         let mut params = vec![("text", text), ("speaker", speaker)];