diff --git a/plugin.sh b/plugin.sh
index b0bc5a3..0586d6b 100755
--- a/plugin.sh
+++ b/plugin.sh
@@ -64,15 +64,14 @@ output_versions(){
 run_stack_deploy() {
   echo "--- start deploy ---"
 
-  if [[ ! -z "${PLUGIN_REG_USER}" ]] && [[ ! -z "${PLUGIN_REG_PASS}" ]]; then
+  if [[ -n "${PLUGIN_REG_USER}" ]] && [[ -n "${PLUGIN_REG_PASS}" ]]; then
     echo "--- discovered secrets, assuming private registry, logging in ---"
     docker -H "$REMOTE_DOCKER_HOST" login -u "${PLUGIN_REG_USER}" -p "${PLUGIN_REG_PASS}"
     docker -H "$REMOTE_DOCKER_HOST" pull "${PLUGIN_IMAGE}"
     echo "${PLUGIN_IMAGE}"
-    docker -H "$REMOTE_DOCKER_HOST" stack deploy -c "$PLUGIN_COMPOSE" "$PLUGIN_STACK"
-  else
-    docker -H "$REMOTE_DOCKER_HOST" stack deploy -c "$PLUGIN_COMPOSE" "$PLUGIN_STACK"
   fi
+  # shellcheck disable=SC2086
+  docker -H "$REMOTE_DOCKER_HOST" stack deploy -c ${PLUGIN_COMPOSE//:/ -c } "$PLUGIN_STACK"
   echo "--- end deploy ---"
 }