diff --git a/lib/kitchen/driver/openstack/volume.rb b/lib/kitchen/driver/openstack/volume.rb
index 38115ca..26a1298 100644
--- a/lib/kitchen/driver/openstack/volume.rb
+++ b/lib/kitchen/driver/openstack/volume.rb
@@ -86,7 +86,7 @@ def create_volume(config, os)
         end
 
         def get_bdm(config, os)
-          bdm = config[:block_device_mapping]
+          bdm = config[:block_device_mapping].clone
           bdm[:volume_id] = create_volume(config, os) if bdm[:make_volume]
           bdm.delete_if { |k, _| k == :make_volume }
           bdm.delete_if { |k, _| k == :snapshot_id }