diff --git a/src/backends/appkit.rs b/src/backends/appkit.rs
index 97f6cb4..8035e26 100644
--- a/src/backends/appkit.rs
+++ b/src/backends/appkit.rs
@@ -198,7 +198,7 @@ impl Backend for AppKit {
 
     fn is_speaking(&self) -> Result<bool, Error> {
         let is_speaking: i8 = unsafe { msg_send![self.0, isSpeaking] };
-        Ok(is_speaking == YES)
+        Ok(is_speaking == YES as i8)
     }
 }