diff --git a/sys/dev/ahci/ahci.c b/sys/dev/ahci/ahci.c
index 41ba9328631..7633fbafe9d 100644
--- a/sys/dev/ahci/ahci.c
+++ b/sys/dev/ahci/ahci.c
@@ -249,7 +249,8 @@ ahci_attach(device_t dev)
 	    (ctlr->caps & AHCI_CAP_64BIT) ? BUS_SPACE_MAXADDR :
 	    BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, NULL, NULL,
 	    BUS_SPACE_MAXSIZE, BUS_SPACE_UNRESTRICTED, BUS_SPACE_MAXSIZE,
-	    0, NULL, NULL, &ctlr->dma_tag)) {
+	    ctlr->dma_coherent ? BUS_DMA_COHERENT : 0, NULL, NULL, 
+	    &ctlr->dma_tag)) {
 		ahci_free_mem(dev);
 		rman_fini(&ctlr->sc_iomem);
 		return (ENXIO);
diff --git a/sys/dev/ahci/ahci.h b/sys/dev/ahci/ahci.h
index b8b908ffc82..6b2a3cb70f0 100644
--- a/sys/dev/ahci/ahci.h
+++ b/sys/dev/ahci/ahci.h
@@ -519,6 +519,7 @@ struct ahci_controller {
 		void			*argument;
 	} interrupt[AHCI_MAX_PORTS];
 	void			(*ch_start)(struct ahci_channel *);
+	int			dma_coherent;	/* DMA is cache-coherent */
 };
 
 enum ahci_err_type {
diff --git a/sys/dev/ahci/ahci_generic.c b/sys/dev/ahci/ahci_generic.c
index a427e7aeaee..073b8dde802 100644
--- a/sys/dev/ahci/ahci_generic.c
+++ b/sys/dev/ahci/ahci_generic.c
@@ -68,6 +68,8 @@ static struct ofw_compat_data compat_data[] = {
 static int
 ahci_fdt_probe(device_t dev)
 {
+	struct ahci_controller *ctlr = device_get_softc(dev);
+	phandle_t node;
 
 	if (!ofw_bus_status_okay(dev))
 		return (ENXIO);
@@ -76,6 +78,8 @@ ahci_fdt_probe(device_t dev)
 		return (ENXIO);
 
 	device_set_desc_copy(dev, "AHCI SATA controller");
+	node = ofw_bus_get_node(dev);
+	ctlr->dma_coherent = OF_hasprop(node, "dma-coherent");
 	return (BUS_PROBE_DEFAULT);
 }
 #endif