diff --git a/build_opts/ALPHA_FS b/build_opts/ALPHA_FS
index a2ab67178..e69cff04b 100644
--- a/build_opts/ALPHA_FS
+++ b/build_opts/ALPHA_FS
@@ -1 +1,3 @@
+TARGET_ISA = 'alpha'
 FULL_SYSTEM = 1
+CPU_MODELS = 'AtomicSimpleCPU,TimingSimpleCPU,O3CPU'