diff --git a/sys/dev/if_ndis/if_ndis.c b/sys/dev/if_ndis/if_ndis.c
index 4981a2e0d93a..c833c4e0032d 100644
--- a/sys/dev/if_ndis/if_ndis.c
+++ b/sys/dev/if_ndis/if_ndis.c
@@ -641,12 +641,12 @@ ndis_attach(dev)
 		sc->ndis_maxpkts = 10;
 
 	sc->ndis_txarray = malloc(sizeof(ndis_packet *) *
-	    NDIS_TXPKTS, M_DEVBUF, M_NOWAIT|M_ZERO);
+	    sc->ndis_maxpkts, M_DEVBUF, M_NOWAIT|M_ZERO);
 
 	/* Allocate a pool of ndis_packets for TX encapsulation. */
 
 	NdisAllocatePacketPool(&i, &sc->ndis_txpool,
-	   NDIS_TXPKTS, PROTOCOL_RESERVED_SIZE_IN_PACKET);
+	    sc->ndis_maxpkts, PROTOCOL_RESERVED_SIZE_IN_PACKET);
 
 	if (i != NDIS_STATUS_SUCCESS) {
 		sc->ndis_txpool = NULL;
diff --git a/sys/dev/if_ndis/if_ndisvar.h b/sys/dev/if_ndis/if_ndisvar.h
index 868b5deb9172..5f9fe756568e 100644
--- a/sys/dev/if_ndis/if_ndisvar.h
+++ b/sys/dev/if_ndis/if_ndisvar.h
@@ -87,7 +87,7 @@ TAILQ_HEAD(nch, ndis_cfglist);
 
 #define NDIS_TXPKTS 64
 #define NDIS_INC(x)		\
-	(x)->ndis_txidx = ((x)->ndis_txidx + 1) % NDIS_TXPKTS
+	(x)->ndis_txidx = ((x)->ndis_txidx + 1) % (x)->ndis_maxpkts
 
 
 #define NDIS_EVENTS 4