diff --git a/hifiscan/audio.py b/hifiscan/audio.py
index 824afc7..0a169ee 100644
--- a/hifiscan/audio.py
+++ b/hifiscan/audio.py
@@ -106,4 +106,4 @@ def write_wav(path: str, rate: int, sound: np.ndarray):
         wav.setnchannels(2)
         wav.setsampwidth(4)
         wav.setframerate(rate)
-        wav.writeframes(stereo)
+        wav.writeframes(stereo.tobytes())