diff --git a/frontend/scripts/build-app.sh b/frontend/scripts/build-app.sh
index 774a93d7c..bfbadbcf3 100755
--- a/frontend/scripts/build-app.sh
+++ b/frontend/scripts/build-app.sh
@@ -3,7 +3,9 @@
 source ~/.bashrc
 set -ex
 
-TAG=`git log -n 1 --pretty=format:%H -- ./`
+if [ -z "${TAG}" ]; then
+    export TAG=`git log -n 1 --pretty=format:%H -- ./`
+fi
 
 yarn install