diff --git a/packer/vars/centos-7.json b/packer/vars/centos-7.json
index 5e6d1c8..aa629a9 100644
--- a/packer/vars/centos-7.json
+++ b/packer/vars/centos-7.json
@@ -4,5 +4,6 @@
   "ssh_user": "centos",
 
   "distro": "CentOS 7",
+  "arch": "x86_64",
   "cloud_user_data": "provision/rh-user_data.sh"
 }
diff --git a/packer/vars/ubuntu-16.04.json b/packer/vars/ubuntu-16.04.json
index b0e9132..972ff75 100644
--- a/packer/vars/ubuntu-16.04.json
+++ b/packer/vars/ubuntu-16.04.json
@@ -1,8 +1,10 @@
 {
   "source_ami_filter_name": "*ubuntu*16.04*",
   "source_ami_filter_owner": "099720109477",
+
   "ssh_user": "ubuntu",
 
   "distro": "Ubuntu 16.04",
+  "arch": "x86_64",
   "cloud_user_data": "provision/null_data.sh"
 }