diff --git a/sys/dev/mfi/mfi_syspd.c b/sys/dev/mfi/mfi_syspd.c
index 739b86621962..e9587dd74d35 100644
--- a/sys/dev/mfi/mfi_syspd.c
+++ b/sys/dev/mfi/mfi_syspd.c
@@ -126,7 +126,8 @@ mfi_syspd_attach(device_t dev)
 		      sectors / (1024 * 1024 / secsize), sectors, sc->pd_id);
 	sc->pd_disk = disk_alloc();
 	sc->pd_disk->d_drv1 = sc;
-	sc->pd_disk->d_maxsize = sc->pd_controller->mfi_max_io * secsize;
+	sc->pd_disk->d_maxsize = min(sc->pd_controller->mfi_max_io * secsize,
+		(sc->pd_controller->mfi_max_sge - 1) * PAGE_SIZE);
 	sc->pd_disk->d_name = "mfisyspd";
 	sc->pd_disk->d_open = mfi_syspd_open;
 	sc->pd_disk->d_close = mfi_syspd_close;