diff --git a/.gitea/workflows/docker_build.yml b/.gitea/workflows/docker_build.yml
index 3bb1e53..5360e45 100644
--- a/.gitea/workflows/docker_build.yml
+++ b/.gitea/workflows/docker_build.yml
@@ -14,7 +14,7 @@ jobs:
         name: Grab formatted repo name
         run: |
           repository_name=$(echo ${{ gitea.repository }} | sed 's/^.*\///')
-          dockerhub_repo_name="${repository_name^}"
+          dockerhub_repo_name=$(echo ${repository_name} | tr '[:upper:]' '[:lower:]')
           echo "repository-name=$repository_name" >> "$GITEA_OUTPUT"
           echo "dockerhub-repo-name=$dockerhub_repo_name" >> "$GITEA_OUTPUT"
       - name: Print repo name (for testing)