diff --git a/usr.sbin/acpi/acpidump/acpi.c b/usr.sbin/acpi/acpidump/acpi.c
--- a/usr.sbin/acpi/acpidump/acpi.c
+++ b/usr.sbin/acpi/acpidump/acpi.c
@@ -1596,7 +1596,7 @@
 		printf("\tRangeIndex=%u\n", (u_int)sysaddr->RangeIndex);
 		printf("\tProximityDomain=%u\n",
 		    (u_int)sysaddr->ProximityDomain);
-		uuid_to_string((uuid_t *)(sysaddr->RangeGuid),
+		uuid_to_string((uuid_t *)(uintptr_t)(sysaddr->RangeGuid),
 		    &uuidstr, &status);
 		if (status != uuid_s_ok)
 			errx(1, "uuid_to_string: status=%u", status);