diff --git a/lib/synth-audio.js b/lib/synth-audio.js
index 5cf8a19..17bf6c0 100644
--- a/lib/synth-audio.js
+++ b/lib/synth-audio.js
@@ -467,7 +467,7 @@ const synthGoogle = async(logger, {
   let audioConfig;
   let extension;
   let sampleRate;
-  if (isGemini || isVoiceCloning) {
+  if (isVoiceCloning) {
     audioConfig = { audioEncoding: 'LINEAR16', sampleRateHertz: 24000 };
     extension = 'wav';
     sampleRate = 24000;
diff --git a/test/synth.js b/test/synth.js
index b62acc4..250ab09 100644
--- a/test/synth.js
+++ b/test/synth.js
@@ -195,7 +195,7 @@ test('Google Gemini TTS synth tests', async(t) => {
       instructions: 'Speak clearly and naturally.',
     });
     t.ok(!result.servedFromCache, `successfully synthesized Google Gemini TTS audio to ${result.filePath}`);
-    t.ok(result.filePath.endsWith('.wav'), 'Gemini TTS audio file has correct extension');
+    t.ok(result.filePath.endsWith('.mp3'), 'Gemini TTS audio file has correct extension');
 
     // Test Gemini TTS with different voice and instructions
     result = await synthAudio(stats, {