diff --git a/include/aio.h b/include/aio.h
index 893c0e9e..c0dab9c5 100644
--- a/include/aio.h
+++ b/include/aio.h
@@ -41,8 +41,8 @@ struct aiocb {
 #define LIO_WAIT 0
 #define LIO_NOWAIT 1
 
-int aio_read(struct aiocb *);
-int aio_write(struct aiocb *);
+ssize_t aio_read(struct aiocb *);
+ssize_t aio_write(struct aiocb *);
 int aio_error(struct aiocb *);
 ssize_t aio_return(struct aiocb *);
 int aio_cancel(int, struct aiocb *);