diff --git a/iocBoot/iocSim/Makefile b/iocBoot/iocSim/Makefile
index d17b764b..e26d2467 100755
--- a/iocBoot/iocSim/Makefile
+++ b/iocBoot/iocSim/Makefile
@@ -1,6 +1,7 @@
 TOP = ../..
 include $(TOP)/configure/CONFIG
 ARCH = linux-x86
+#ARCH = linux-x86_64
 #ARCH = vxWorks-ppc604
 TARGETS = cdCommands
 TARGETS += envPaths