diff --git a/.gitea/workflows/docker-build.yml b/.gitea/workflows/docker-build.yml
index a57a7f6..c2f8eb0 100644
--- a/.gitea/workflows/docker-build.yml
+++ b/.gitea/workflows/docker-build.yml
@@ -32,10 +32,11 @@ jobs:
           if [ -z "$REG_HOST_RAW" ]; then echo "Missing GITEA_SERVER_URL/GITHUB_SERVER_URL"; exit 1; fi
           REG_HOST="${REG_HOST_RAW#http://}"; REG_HOST="${REG_HOST#https://}"; REG_HOST="${REG_HOST%%/*}"
           # Override if needed (set secret/env to git.thumeit.com[:port])
-          OVERRIDE="${{ secrets.GITEA_REGISTRY_HOST }}"; [ -z "$OVERRIDE" ] && OVERRIDE="${GITEA_REGISTRY_HOST}"
-          [ -z "$OVERRIDE" ] && OVERRIDE="${{ secrets.REGISTRY_HOST }}"
-          [ -z "$OVERRIDE" ] && OVERRIDE="${REGISTRY_HOST}"
-          if [ "$REG_HOST" = "gitea" ] && [ -n "$OVERRIDE" ]; then REG_HOST="$OVERRIDE"; fi
+          OVERRIDE="${{ secrets.GITEA_REGISTRY_HOST }}"
+          [ -z "${OVERRIDE:-}" ] && OVERRIDE="${GITEA_REGISTRY_HOST:-}"
+          [ -z "${OVERRIDE:-}" ] && OVERRIDE="${{ secrets.REGISTRY_HOST }}"
+          [ -z "${OVERRIDE:-}" ] && OVERRIDE="${REGISTRY_HOST:-}"
+          if [ "$REG_HOST" = "gitea" ] && [ -n "${OVERRIDE:-}" ]; then REG_HOST="$OVERRIDE"; fi
           echo "owner=$OWNER" >> $GITHUB_OUTPUT
           echo "repo=$REPO" >> $GITHUB_OUTPUT
           echo "host=$REG_HOST" >> $GITHUB_OUTPUT