diff --git a/src/backends/android.rs b/src/backends/android.rs
index eb32586..3f6d422 100644
--- a/src/backends/android.rs
+++ b/src/backends/android.rs
@@ -396,7 +396,7 @@ impl Backend for Android {
         unimplemented!()
     }
 
-    fn set_voice(&mut self, voice: &Voice) -> Result<(), Error> {
+    fn set_voice(&mut self, _voice: &Voice) -> Result<(), Error> {
         unimplemented!()
     }
 }