diff --git a/Dockerfile b/Dockerfile
index e45686c..23dde5a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -115,7 +115,10 @@ COPY mat.settings.php /var/www/html/sites/default/settings.php
 RUN chmod -R g+w,g+r /var/www/config
 
 # Fix file ownership on docroot.
-RUN chown -R www-data:www-data /var/www
+RUN chown -R www-data:www-data /var/www/html
+
+# Fix file ownership on vendor.
+RUN chown -R www-data:www-data /var/www/vendor
 
 RUN composer self-update --2