diff --git a/examples/sine_synth.rs b/examples/sine_synth.rs
index b459b396..62efe54a 100644
--- a/examples/sine_synth.rs
+++ b/examples/sine_synth.rs
@@ -109,7 +109,7 @@ impl Plugin for SineSynth {
 
     fn process(&mut self, buffer: &mut AudioBuffer<f32>) {
         let samples = buffer.samples();
-        let (_, outputs) = buffer.split();
+        let (_, mut outputs) = buffer.split();
         let output_count = outputs.len();
         let per_sample = self.time_per_sample();
         let mut output_sample;
diff --git a/src/buffer.rs b/src/buffer.rs
index f507ccfe..50ada039 100644
--- a/src/buffer.rs
+++ b/src/buffer.rs
@@ -223,7 +223,7 @@ impl<'a, T> Outputs<'a, T> {
     }
 
     /// Mutably access channel at the given index, unchecked
-    pub fn get_mut(&self, i: usize) -> &'a mut [T] {
+    pub fn get_mut(&mut self, i: usize) -> &'a mut [T] {
         unsafe { slice::from_raw_parts_mut(self.bufs[i], self.samples) }
     }