diff --git a/src/coreaudio/mod.rs b/src/coreaudio/mod.rs
index e3b6598..2366f0e 100644
--- a/src/coreaudio/mod.rs
+++ b/src/coreaudio/mod.rs
@@ -160,6 +160,11 @@ impl Voice {
         unimplemented!()
     }
 
+    #[inline]
+    pub fn get_period(&self) -> usize {
+        0
+    }
+
     #[inline]
     pub fn get_pending_samples(&self) -> usize {
         if let Some(ready) = self.update_last_ready() {