diff --git a/usr.sbin/pciconf/pciconf.c b/usr.sbin/pciconf/pciconf.c
--- a/usr.sbin/pciconf/pciconf.c
+++ b/usr.sbin/pciconf/pciconf.c
@@ -1126,7 +1126,11 @@
 	if (*reg == '\0' || *el != '\0')
 		errx(1, "Invalid bar specification %s", reg);
 	pbm.pbm_flags = 0;
-	pbm.pbm_memattr = VM_MEMATTR_UNCACHEABLE; /* XXX */
+#ifdef VM_MEMATTR_DEVICE
+	pbm.pbm_memattr = VM_MEMATTR_DEVICE;
+#else
+	pbm.pbm_memattr = VM_MEMATTR_UNCACHEABLE;
+#endif
 
 	fd = open(_PATH_DEVPCI, O_RDWR, 0);
 	if (fd < 0)