diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 3a42fa5b7..bbebae3cf 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -91,7 +91,7 @@ setup:containers:frontend:
     - echo ${CI_JOB_MANUAL}
     - test ${CI_JOB_MANUAL} == true && echo "Force rebuilding container."
     - >
-      if [ -z ${IMAGE_EXISTS} -o ${CI_JOB_MANUAL} == true ] ; then
+      if [ ( -z ${IMAGE_EXISTS} ) -o ( ${CI_JOB_MANUAL} = true ) ] ; then
         echo "Building image..."
         buildah bud -t ${IMAGE_TAG} --build-arg PROJECT_DIR=${CI_PROJECT_DIR} --volume ${CI_PROJECT_DIR}:/tmp/${CI_PROJECT_DIR} --file docker/frontend/Dockerfile
         buildah push --creds "${CI_REGISTRY_USER}:${CI_JOB_TOKEN}" ${IMAGE_TAG} ${REGISTRY_DESTINATION}