--- a/sys/dev/raid/mps/mps.c
+++ b/sys/dev/raid/mps/mps.c
@@ mps_intr_locked @@
 		if ((reply < sc->reply_frames)
-		 || (reply > (sc->reply_frames +
+		 || (reply >= (sc->reply_frames +
 		     (sc->fqdepth * sc->facts->ReplyFrameSize * 4)))) {