diff --git a/sys/dev/ntb/if_ntb/if_ntb.c b/sys/dev/ntb/if_ntb/if_ntb.c
index 6684edd7d2f..b172cf3b6be 100644
--- a/sys/dev/ntb/if_ntb/if_ntb.c
+++ b/sys/dev/ntb/if_ntb/if_ntb.c
@@ -616,6 +616,10 @@ ntb_transport_probe(struct ntb_softc *ntb)
 		mw->xlat_size = 0;
 		mw->virt_addr = NULL;
 		mw->dma_addr = 0;
+
+		rc = ntb_mw_set_wc(nt->ntb, i, VM_MEMATTR_WRITE_COMBINING);
+		if (rc)
+			ntb_printf(0, "Unable to set mw%d caching\n", i);
 	}
 
 	qp_bitmap = ntb_db_valid_mask(ntb);