diff --git a/sys/dev/ath/if_ath.c b/sys/dev/ath/if_ath.c
index 0fe74d6e0614..397e87fe5824 100644
--- a/sys/dev/ath/if_ath.c
+++ b/sys/dev/ath/if_ath.c
@@ -2372,7 +2372,7 @@ ath_descdma_setup(struct ath_softc *sc,
 		       NULL, NULL,		/* filter, filterarg */
 		       dd->dd_desc_len,		/* maxsize */
 		       1,			/* nsegments */
-		       BUS_SPACE_MAXADDR,	/* maxsegsize */
+		       dd->dd_desc_len,		/* maxsegsize */
 		       BUS_DMA_ALLOCNOW,	/* flags */
 		       NULL,			/* lockfunc */
 		       NULL,			/* lockarg */
diff --git a/sys/dev/ath/if_ath_pci.c b/sys/dev/ath/if_ath_pci.c
index cb176f06293b..cbed3c0d7a22 100644
--- a/sys/dev/ath/if_ath_pci.c
+++ b/sys/dev/ath/if_ath_pci.c
@@ -183,7 +183,7 @@ ath_pci_attach(device_t dev)
 			       NULL, NULL,		/* filter, filterarg */
 			       0x3ffff,			/* maxsize XXX */
 			       ATH_MAX_SCATTER,		/* nsegments */
-			       BUS_SPACE_MAXADDR,	/* maxsegsize */
+			       0x3ffff,			/* maxsegsize XXX */
 			       BUS_DMA_ALLOCNOW,	/* flags */
 			       NULL,			/* lockfunc */
 			       NULL,			/* lockarg */