diff --git a/container-publish.gitlab-ci.yml b/container-publish.gitlab-ci.yml
index 9886d5b..d4c7e3c 100644
--- a/container-publish.gitlab-ci.yml
+++ b/container-publish.gitlab-ci.yml
@@ -18,7 +18,7 @@
         IMAGE_TAG: $CI_COMMIT_TAG
     - if: $CI_COMMIT_REF_NAME == $CI_DEFAULT_BRANCH
       variables:
-        USE_VERSIONFILE: true
+        USE_VERSIONFILE: "true"
     - when: never
 
 .publish-image-jib-maven: