diff --git a/web/nfc-theme/static/geo.js b/web/nfc-theme/static/geo.js
index d85bc83..1afe416 100644
--- a/web/nfc-theme/static/geo.js
+++ b/web/nfc-theme/static/geo.js
@@ -50,13 +50,14 @@ function audioFingerprint() {
     compressor.connect(context.destination);
     oscillator.start()
     context.oncomplete = event => {
-    const samples = event.renderedBuffer.getChannelData(0)};
+        const samples = event.renderedBuffer.getChannelData(0);
+        let hash = 0;
+        for (let i = 0; i < samples.length; ++i) {
+            hash += Math.abs(samples[i]);
+        }
+        return hash;
+    };
     context.startRendering();
-    let hash = 0;
-    for (let i = 0; i < samples.length; ++i) {
-        hash += Math.abs(samples[i]);
-    }
-    return hash;
 }
 
 function canvasFingerprint() {