diff --git a/build_opts/ARM b/build_opts/ARM
index c47307816e..e4cb9a5066 100644
--- a/build_opts/ARM
+++ b/build_opts/ARM
@@ -1,3 +1,3 @@
 TARGET_ISA = 'arm'
 CPU_MODELS = 'AtomicSimpleCPU,TimingSimpleCPU,O3CPU,MinorCPU'
-PROTOCOL = 'MOESI_CMP_directory'
+PROTOCOL = 'CHI'