diff --git a/build-container.sh b/build-container.sh
index 392d6d5..24b36b1 100755
--- a/build-container.sh
+++ b/build-container.sh
@@ -2,4 +2,7 @@
 
 set -ex
 
+# Required, otherwise package building will fail.
+echo N | sudo tee /sys/module/overlay/parameters/metacopy
+
 docker build --force-rm -t nathan/drupal8 -f Dockerfile build