diff --git a/app/capture/page.tsx b/app/capture/page.tsx
index 868dab8..1f6b23f 100644
--- a/app/capture/page.tsx
+++ b/app/capture/page.tsx
@@ -60,7 +60,7 @@ export default function CapturePage() {
         try {
           const blob = new Blob(chunksRef.current, { type: mimeTypeRef.current });
           const form = new FormData();
-          form.append('file', blob, 'capture.webm');
+          form.append('audio', blob, 'capture.webm');
           const res = await fetch(`${API_URL}/api/capture`, { method: 'POST', body: form });
           if (res.ok) {
             setState('saved');