diff --git a/src/voice/stt.rs b/src/voice/stt.rs
index 262f6e9..1841db0 100644
--- a/src/voice/stt.rs
+++ b/src/voice/stt.rs
@@ -141,10 +141,11 @@ fn transcribe(config: &VoiceConfig, audio: &[i16]) -> Result<String, String> {
         }
     });
 
-    let url = format!("https://speech.googleapis.com/v1/speech:recognize?key={api_key}");
+    let url = "https://speech.googleapis.com/v1/speech:recognize";
 
     let client = reqwest::blocking::Client::new();
-    let resp = client.post(&url)
+    let resp = client.post(url)
+        .header("x-goog-api-key", &api_key)
         .json(&body)
         .send()
         .map_err(|e| format!("STT request: {e}"))?;