diff --git a/scenes/main.gd b/scenes/main.gd
index 8edddf3..b80edb7 100644
--- a/scenes/main.gd
+++ b/scenes/main.gd
@@ -99,7 +99,7 @@ func _on_wav_button_pressed() -> void:
 	# save wav
 	var wav := AudioStreamWAV.new()
 	wav.format = AudioStreamWAV.FORMAT_8_BITS
-	wav.mix_rate = sample_hz
+	wav.mix_rate = int(sample_hz)
 	wav.stereo = false
 	wav.data = data