diff --git a/containers/jug/dev.Dockerfile b/containers/jug/dev.Dockerfile
index 54cc3a708e0fb95f69ac570feede532b2a4e4b7f..ddb79919e294045cb38e4cfa73e34b611daa2404 100644
--- a/containers/jug/dev.Dockerfile
+++ b/containers/jug/dev.Dockerfile
@@ -207,6 +207,7 @@ ARG TARGETPLATFORM
 RUN --mount=type=cache,target=/var/cache/spack                          \
     --mount=type=secret,id=mirrors,target=/opt/spack/etc/spack/mirrors.yaml \
     <<EOF
+set -e
 make --jobs ${jobs} --keep-going --directory /opt/spack-environment \
   SPACK_ENV=${SPACK_ENV} SPACK_INSTALL_FLAGS="--use-buildcache only"
 spack gc --yes-to-all