Index: sys/dev/e1000/if_lem.c
===================================================================
--- sys/dev/e1000/if_lem.c
+++ sys/dev/e1000/if_lem.c
@@ -543,8 +543,8 @@
 	 */
 	adapter->hw.mac.report_tx_early = 1;
 
-	tsize = roundup2(adapter->num_tx_desc * sizeof(struct e1000_tx_desc),
-	    EM_DBA_ALIGN);
+	tsize = roundup2((adapter->num_tx_desc + 1) *
+	    sizeof(struct e1000_tx_desc), EM_DBA_ALIGN);
 
 	/* Allocate Transmit Descriptor ring */
 	if (lem_dma_malloc(adapter, tsize, &adapter->txdma, BUS_DMA_NOWAIT)) {
@@ -555,8 +555,8 @@
 	adapter->tx_desc_base = 
 	    (struct e1000_tx_desc *)adapter->txdma.dma_vaddr;
 
-	rsize = roundup2(adapter->num_rx_desc * sizeof(struct e1000_rx_desc),
-	    EM_DBA_ALIGN);
+	rsize = roundup2((adapter->num_rx_desc + 1) *
+	    sizeof(struct e1000_rx_desc), EM_DBA_ALIGN);
 
 	/* Allocate Receive Descriptor ring */
 	if (lem_dma_malloc(adapter, rsize, &adapter->rxdma, BUS_DMA_NOWAIT)) {