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
@@ -2130,6 +2130,7 @@
 static uint64_t
 pci_xhci_portregs_read(struct pci_xhci_softc *sc, uint64_t offset)
 {
+	struct pci_xhci_portregs *portregs;
 	int port;
 	uint32_t *p;
 
@@ -2148,7 +2149,8 @@
 
 	offset = (offset - 0x3F0) % 0x10;
 
-	p = &sc->portregs[port].portsc;
+	portregs = XHCI_PORTREG_PTR(sc, port);
+	p = &portregs->portsc;
 	p += offset / sizeof(uint32_t);
 
 	DPRINTF(("pci_xhci: portregs read offset 0x%lx port %u -> 0x%x",