diff --git a/frontend/build.sh b/frontend/build.sh
index ba89f62aa..cea9019bd 100644
--- a/frontend/build.sh
+++ b/frontend/build.sh
@@ -10,6 +10,9 @@
 
 ARCH=${ARCH:-amd64}
 
+GIT_ROOT=$(git rev-parse --show-toplevel)
+source $GIT_ROOT/scripts/lib/_docker.sh
+
 git_sha=$(git rev-parse --short HEAD)
 image_tag=${IMAGE_TAG:-$git_sha}
 check_prereq() {