diff --git a/.drone.yml b/.drone.yml
index 87b2cc8..b976e12 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -52,6 +52,7 @@ steps:
   - |
     packer build \
       -on-error=cleanup -timestamp-ui \
+      -parallel=false \
       -var vm_name=$DRONE_BUILD_NUMBER-${DRONE_COMMIT_SHA:0:10} \
       -var docker_username=$${DOCKER_USERNAME} \
       -var docker_password=$${DOCKER_PASSWORD} \