diff --git a/src/audio.rs b/src/audio.rs
index b095b77..7f84346 100644
--- a/src/audio.rs
+++ b/src/audio.rs
@@ -81,7 +81,8 @@ impl Audio {
 
     pub fn update(&mut self, mut samples: &[f32]) {
         while self.input_buffer.len() + samples.len() >= self.sampler.input_frames_next() * 2 {
-            let samples_needed = (self.sampler.input_frames_next() * 2) - self.input_buffer.len();
+            let samples_needed =
+                (self.sampler.input_frames_next() * 2).saturating_sub(self.input_buffer.len());
             let (current_samples, future_samples) = samples.split_at(samples_needed);
             self.input_buffer.extend_from_slice(current_samples);
             samples = future_samples;