diff --git a/jobs/hook_vm.yml b/jobs/hook_vm.yml
index 9e28c28..096c7b0 100644
--- a/jobs/hook_vm.yml
+++ b/jobs/hook_vm.yml
@@ -69,7 +69,7 @@
   when: (not vagrantfile.stat.exists) and (not box_status.stat.exists or (box_status.stat.isreg and clobber_output))
 
 - name: Extract the virtual machine disk (VMDK) file from the box.
-  command: tar -xvf {{ output_box }} -C {{ artefact_dir }} ./box-disk1.vmdk
+  command: tar -xzvf {{ output_box }} -C {{ artefact_dir }} ./box-disk1.vmdk
     chdir={{ artefact_dir }}
     creates={{ artefact_dir }}/box-disk1.vmdk
   when: not zip_status.stat.exists or (zip_status.stat.isreg and clobber_output)