diff --git a/lib/libc/sys/aio_error.2 b/lib/libc/sys/aio_error.2
index ae959ab14c7..ea93237a533 100644
--- a/lib/libc/sys/aio_error.2
+++ b/lib/libc/sys/aio_error.2
@@ -33,7 +33,7 @@
 .Sh SYNOPSIS
 .Fd #include <aio.h>
 .Ft int
-.Fn aio_error "struct aiocb *iocb"
+.Fn aio_error "const struct aiocb *iocb"
 .Sh DESCRIPTION
 The
 .Fn aio_error