diff --git a/auto/config b/auto/config
index 88ca144..d95a7f9 100755
--- a/auto/config
+++ b/auto/config
@@ -178,6 +178,6 @@ lb config noauto \
     --iso-volume "PureOS $dist_version $FLAVOR_PRETTY" \
     --image-name $IMAGE_FILENAME \
     --linux-flavours $kernel_flavour \
-    --debootstrap-options --keyring=/usr/share/keyrings/pureos-archive-keyring.gpg \
+    --debootstrap-options '--merged-usr --keyring=/usr/share/keyrings/pureos-archive-keyring.gpg' \
     $lb_opts \
     "${@}"