diff --git a/usr.sbin/bhyve/pci_xhci.c b/usr.sbin/bhyve/pci_xhci.c
--- a/usr.sbin/bhyve/pci_xhci.c
+++ b/usr.sbin/bhyve/pci_xhci.c
@@ -2706,7 +2706,7 @@
 static int
 pci_xhci_parse_devices(struct pci_xhci_softc *sc, nvlist_t *nvl)
 {
-	struct pci_xhci_dev_emu	*dev;
+	struct pci_xhci_dev_emu	*dev, **devices, **slots;
 	struct usb_devemu	*ue;
 	const nvlist_t *slots_nvl, *slot_nvl;
 	const char *name, *device;
@@ -2718,12 +2718,12 @@
 	usb3_port = sc->usb3_port_start;
 	usb2_port = sc->usb2_port_start;
 
-	sc->devices = calloc(XHCI_MAX_DEVS, sizeof(struct pci_xhci_dev_emu *));
-	sc->slots = calloc(XHCI_MAX_SLOTS, sizeof(struct pci_xhci_dev_emu *));
+	devices = calloc(XHCI_MAX_DEVS, sizeof(struct pci_xhci_dev_emu *));
+	slots = calloc(XHCI_MAX_SLOTS, sizeof(struct pci_xhci_dev_emu *));
 
 	/* port and slot numbering start from 1 */
-	sc->devices--;
-	sc->slots--;
+	sc->devices = devices - 1;
+	sc->slots = slots - 1;
 
 	ndevices = 0;
 
@@ -2834,8 +2834,8 @@
 		free(XHCI_DEVINST_PTR(sc, i));
 	}
 
-	free(sc->devices + 1);
-	free(sc->slots + 1);
+	free(devices);
+	free(slots);
 
 	return (-1);
 }