diff --git a/tests/roles/bootstrap-host/templates/user_variables.aio.yml.j2 b/tests/roles/bootstrap-host/templates/user_variables.aio.yml.j2
index a682abe9f9..dcd58f3366 100644
--- a/tests/roles/bootstrap-host/templates/user_variables.aio.yml.j2
+++ b/tests/roles/bootstrap-host/templates/user_variables.aio.yml.j2
@@ -178,7 +178,7 @@ lxc_container_backing_store: "machinectl"
 
 # Allow the container store sufficient space to build everything we need.
 #  Size is in GB:
-lxc_host_machine_volume_size: 1024G
+lxc_host_machine_volume_size: 1024
 
 ## Enable LBaaSv2 in the AIO
 neutron_plugin_base: