diff --git a/writing_env/Dockerfile b/writing_env/Dockerfile
index 61af146..ab2055e 100644
--- a/writing_env/Dockerfile
+++ b/writing_env/Dockerfile
@@ -63,7 +63,7 @@ USER blog
 # provision
 RUN set -ex \
  && git clone https://github.com/xsteadfastx/batcave.git ~/.batcave \
- && ansible-playbook -i ~/.batcave/hosts ~/.batcave/shell.yml -c local --extra-vars="hosts=127.0.0.1" \
+ && ansible-playbook -i ~/.batcave/hosts ~/.batcave/shell.yml -c local --extra-vars="host=127.0.0.1" \
  && ansible-playbook -c local /home/blog/playbooks/writing_env.yml
 
 # clean up