diff --git a/Dockerfile b/Dockerfile
index 14e76df..4bdd81d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -97,7 +97,7 @@ RUN mkdir "/home/${NB_USER}/work" && \
 # Correct permissions
 # Do all this in a single RUN command to avoid duplicating all of the
 # files across image layers when the permissions change
-RUN ls
+RUN sleep 120
 COPY --chown="${NB_UID}:${NB_GID}" ./initial-condarc "${CONDA_DIR}/.condarc"
 WORKDIR /tmp
 RUN set -x && \