diff --git a/src/backends/appkit.rs b/src/backends/appkit.rs
index 97f6cb4..259d88e 100644
--- a/src/backends/appkit.rs
+++ b/src/backends/appkit.rs
@@ -196,6 +196,18 @@ impl Backend for AppKit {
         Ok(())
     }
 
+    #[cfg(target_arch = "aarch64")]
+    fn is_speaking(&self) -> Result<bool, Error> {
+        let is_speaking: i8 = unsafe { msg_send![self.0, isSpeaking] };
+        Ok(is_speaking == YES as i8)
+    }
+
+    #[cfg(target_arch = "x86")]
+    #[cfg(target_arch = "x86_64")]
+    #[cfg(target_arch = "mips")]
+    #[cfg(target_arch = "powerpc")]
+    #[cfg(target_arch = "powerpc64")]
+    #[cfg(target_arch = "arm")]
     fn is_speaking(&self) -> Result<bool, Error> {
         let is_speaking: i8 = unsafe { msg_send![self.0, isSpeaking] };
         Ok(is_speaking == YES)