diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 191fe9c..7ff7893 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -54,7 +54,7 @@ stages:
     - docker build -f Dockerfile.${IMAGE_ARCH} -t ${IMAGE_TAG}-${IMAGE_ARCH} .
     - docker push ${IMAGE_TAG}-${IMAGE_ARCH}
     - |
-      [[ ${DEFAULT_ARCH} == "true" ]] && \
+      [[ "${DEFAULT_ARCH}" = "true" ]] && \
         docker tag ${IMAGE_TAG}-${IMAGE_ARCH} ${IMAGE_TAG} && \
         docker push ${IMAGE_TAG}