diff --git a/sys/dev/raid/mps/mps_user.c b/sys/dev/raid/mps/mps_user.c
--- a/sys/dev/raid/mps/mps_user.c
+++ b/sys/dev/raid/mps/mps_user.c
@@ -1857,7 +1857,8 @@
 	if ((size >= sizeof(sc->recorded_events)) && (status == 0)) {
 		mps_unlock(sc);
 		if (copyout((void *)sc->recorded_events,
-		    PTRIN(data->PtrEvents), size) != 0)
+		    PTRIN(data->PtrEvents),
+		    sizeof(sc->recorded_events)) != 0)
 			status = EFAULT;
 		mps_lock(sc);
 	} else {