diff --git a/src/main.rs b/src/main.rs
index 3929704..6392fd3 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -121,7 +121,7 @@ fn new_listener() -> Listener {
 
 impl Listener {
    fn listen(self, mut cb: impl FnMut(Vec<f32>)) {
-      let (send, recv) = std::sync::mpsc::channel();
+      let (send, recv) = std::sync::mpsc::sync_channel(5_000_000);
       thread::spawn(move || { self._listen(send); });
       loop {
          match recv.recv() {
@@ -131,7 +131,7 @@ impl Listener {
       }
    }
 
-   fn _listen(self, ch: std::sync::mpsc::Sender<Vec<f32>>) {
+   fn _listen(self, ch: std::sync::mpsc::SyncSender<Vec<f32>>) {
       let host = cpal::default_host();
       let device = host.default_input_device().unwrap();
       let cfg = device.supported_input_configs()