diff --git a/16-to-18/Dockerfile b/16-to-18/Dockerfile
index 5997caf..9ca5267 100644
--- a/16-to-18/Dockerfile
+++ b/16-to-18/Dockerfile
@@ -21,7 +21,7 @@ RUN set -eux; \
 	"$PGBINNEW/postgres" --version
 
 ENV PGDATAOLD /var/lib/postgresql/16/data
-ENV PGDATANEW /var/lib/postgresql/18/docker
+ENV PGDATANEW /var/lib/postgresql/18/data
 
 RUN install \
 		--verbose \