diff --git a/.drone.yml b/.drone.yml
index 04c5cb4..0f4b723 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -16,7 +16,7 @@ steps:
   image: xoxys/molecule:gce
   commands:
   - /bin/bash /docker-entrypoint.sh
-  - echo "$GCE_CREDENTIALS_JSON" > ${GCE_CREDENTIALS_FILE}
+  - echo "$GCE_CREDENTIALS_JSON" > $$GCE_CREDENTIALS_FILE
   - ls -l /root/
   - molecule create --scenario-name gce-centos-7
   - molecule converge --scenario-name gce-centos-7