diff --git a/src/backends/ns_speech_synthesizer.rs b/src/backends/ns_speech_synthesizer.rs
index 946d3d6..09999e0 100644
--- a/src/backends/ns_speech_synthesizer.rs
+++ b/src/backends/ns_speech_synthesizer.rs
@@ -132,3 +132,12 @@ impl Backend for NSSpeechSynthesizerBackend {
         unimplemented!()
     }
 }
+
+impl Drop for NSSpeechSynthesizerBackend {
+    fn drop(&mut self) {
+        unsafe {
+            let _: Object = msg_send!(self.0, release);
+            let _: Object = msg_send!(self.1, release);
+        }
+    }
+}