diff --git a/shippable.yml b/shippable.yml
index f7f474e..f7eaa90 100644
--- a/shippable.yml
+++ b/shippable.yml
@@ -26,5 +26,5 @@ build:
 
   ci:
     - shopt -s dotglob && cp ${SHIPPABLE_BUILD_DIR}/. /docker/ -rf && shopt -u dotglob
-    - [ "${IS_RELEASE}" == true ] && PUSH='--push' || PUSH=''
+    - [ $IS_RELEASE == true ] && PUSH='--push' || PUSH=''
     - docker run --rm --privileged --volumes-from ${SHIPPABLE_CONTAINER_NAME} -v /root/.docker:/root/.docker hassioaddons/build-env:latest --target ${ADDON} --from "homeassistant/{arch}-base:latest" --tag-latest ${PUSH} --${ARCH}