diff --git a/.devcontainer/build.sh b/.devcontainer/build.sh
index f7b640c0..10f8b69a 100755
--- a/.devcontainer/build.sh
+++ b/.devcontainer/build.sh
@@ -1,3 +1,4 @@
 #!/bin/sh
+set -eu
 cd $(dirname $0)/../
 docker run --rm -v ${PWD}:/app $(docker build -q -f .devcontainer/Dockerfile .)