diff --git a/01-play-sine/src/main.rs b/01-play-sine/src/main.rs
index 6ede0bf..be2a3bd 100644
--- a/01-play-sine/src/main.rs
+++ b/01-play-sine/src/main.rs
@@ -98,7 +98,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
                         my_data.time += 1;
                         t
                     };
-                    let time_secs = (time_samples as f32) / 48000.0 as f32;
+                    let time_secs = (time_samples as f32) / (sample_rate as f32);
                     let sine_freq = 440.0;
                     let pi2 = 2.0 * 3.141;
                     let phi = pi2 * time_secs * sine_freq;