diff --git a/rtiow/src/renderer.rs b/rtiow/src/renderer.rs
index b43d66e..2088976 100644
--- a/rtiow/src/renderer.rs
+++ b/rtiow/src/renderer.rs
@@ -263,17 +263,20 @@ fn render_worker(
     output_chan: &SyncSender<Response>,
 ) {
     loop {
-        match input_chan.lock().unwrap().recv() {
+        let job = { input_chan.lock().unwrap().recv() };
+        match job {
             Err(err) => {
                 info!("Shutting down render_worker {}: {}", tid, err);
                 return;
             }
             Ok(req) => match req {
                 Request::Line { width, y } => {
+                    trace!("tid {} width {} y {}", tid, width, y);
                     let pixels = (0..width).map(|x| render_pixel(scene, x, y)).collect();
                     output_chan.send(Response::Line { width, y, pixels });
                 }
                 Request::Pixel { x, y } => {
+                    trace!("tid {} x {} y {}", tid, x, y);
                     let pixel = render_pixel(scene, x, y);
                     output_chan.send(Response::Pixel { x, y, pixel });
                 }