diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index ca5e6653..68def3bd 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -18,7 +18,7 @@ before_script:
   - RELEASE=$(echo $CI_COMMIT_REF_NAME | sed "s{.*\/\(.*\)\/.*{\1{g")
   - RELEASE_DATE="$(date '+%Y-%m-%d')"
   - IMAGE_TAG=$(echo $CI_COMMIT_REF_SLUG | sed "s/^\([[:digit:]][[:digit:]]\)-\([[:digit:]]\)/\1\.\2/g")
-  - IMAGE_TAG_DATE:"${IMAGE_TAG}-${RELEASE_DATE}"
+  - IMAGE_TAG_DATE="${IMAGE_TAG}-${RELEASE_DATE}"
   - docker login -u gitlab-ci-token -p $CI_JOB_TOKEN registry.gitlab.com
 
 merge_request: