diff --git a/libao-async-ffi.rkt b/libao-async-ffi.rkt
index 6734c35..a4548d3 100644
--- a/libao-async-ffi.rkt
+++ b/libao-async-ffi.rkt
@@ -70,7 +70,7 @@
 (define-libao-async ao_is_at_second_async(_fun _libao-async-handle-pointer -> _double))
 
 ;extern int ao_is_at_music_id_async(void *handle);
-(define-libao-async ao_is_at_music_id_async (_fun _libao-async-handle-pointer -> _integer))
+(define-libao-async ao_is_at_music_id_async (_fun _libao-async-handle-pointer -> _int))
 
 ;extern double ao_music_duration_async(void *handle);
 (define-libao-async ao_music_duration_async(_fun _libao-async-handle-pointer -> _double))