diff --git a/inventory/group_vars/all b/inventory/group_vars/all
index 99dd9db7a1..90631f02f9 100644
--- a/inventory/group_vars/all
+++ b/inventory/group_vars/all
@@ -70,6 +70,7 @@ virt_install_command: "{{ virt_install_command_one_nic }}"
 
 main_bridge: br0
 nfs_bridge: br1
+mac_address: RANDOM
 
 virt_install_command_one_nic: virt-install -n {{ inventory_hostname }}
                  --memory={{ mem_size }},maxmemory={{ max_mem_size }} --memballoon virtio