diff --git a/sys/dev/bwi/if_bwi.c b/sys/dev/bwi/if_bwi.c
index 53fb58faf78..ad41bc67544 100644
--- a/sys/dev/bwi/if_bwi.c
+++ b/sys/dev/bwi/if_bwi.c
@@ -1945,7 +1945,7 @@ bwi_dma_alloc(struct bwi_softc *sc)
 				NULL, NULL,
 				tx_ring_sz,
 				1,
-				BUS_SPACE_MAXSIZE_32BIT,
+				tx_ring_sz,
 				0,
 				NULL, NULL,
 				&sc->sc_txring_dtag);
@@ -1975,7 +1975,7 @@ bwi_dma_alloc(struct bwi_softc *sc)
 				NULL, NULL,
 				rx_ring_sz,
 				1,
-				BUS_SPACE_MAXSIZE_32BIT,
+				rx_ring_sz,
 				0,
 				NULL, NULL,
 				&sc->sc_rxring_dtag);
@@ -2100,7 +2100,7 @@ bwi_dma_txstats_alloc(struct bwi_softc *sc, uint32_t ctrl_base,
 				NULL, NULL,
 				dma_size,
 				1,
-				BUS_SPACE_MAXSIZE_32BIT,
+				dma_size,
 				0,
 				NULL, NULL,
 				&st->stats_ring_dtag);
@@ -2148,7 +2148,7 @@ bwi_dma_txstats_alloc(struct bwi_softc *sc, uint32_t ctrl_base,
 				NULL, NULL,
 				dma_size,
 				1,
-				BUS_SPACE_MAXSIZE_32BIT,
+				dma_size,
 				0,
 				NULL, NULL,
 				&st->stats_dtag);