diff --git a/vl.c b/vl.c
index 487c4a8..355f7ff 100644
--- a/vl.c
+++ b/vl.c
@@ -6707,6 +6707,8 @@
     qemu_register_machine(&realview_machine);
 #elif defined(TARGET_SH4)
     qemu_register_machine(&shix_machine);
+#elif defined(TARGET_ALPHA)
+    /* XXX: TODO */
 #else
 #error unsupported CPU
 #endif