diff --git a/build_app_package.bash b/build_app_package.bash
index 0593b2b..0bb9bdf 100755
--- a/build_app_package.bash
+++ b/build_app_package.bash
@@ -4,12 +4,13 @@ set -euo pipefail
 
 GIT_COMMIT=$(git rev-parse main)
 GIT_COMMIT_SHORT=$(echo "$GIT_COMMIT" | cut -b -8)
+DOCKER_TAG="ptth:latest"
 
 mkdir -p app_packages
 
-git archive --format=tar "$GIT_COMMIT" | sudo docker build -t ptth:latest --build-arg "git_version=$GIT_COMMIT" -
+git archive --format=tar "$GIT_COMMIT" | sudo docker build -t "$DOCKER_TAG" --build-arg "git_version=$GIT_COMMIT" -
 
-sudo docker run --rm ptth:latest tar -c \
+sudo docker run --rm "$DOCKER_TAG" tar -c \
 ptth_relay \
 handlebars \
 git_version.txt \