diff --git a/.tugboat/config.yml b/.tugboat/config.yml
index 3b0f3a8ea03fa4d5cd7de31409bbee5166047fab..3de0354b9a43103f002158accf981ce97c2d1fcb 100644
--- a/.tugboat/config.yml
+++ b/.tugboat/config.yml
@@ -30,6 +30,7 @@ services:
         - chmod 2775 $TUGBOAT_ROOT/project
         - chgrp -R www-data $TUGBOAT_ROOT/project
         - chmod g+w $TUGBOAT_ROOT/project/web
+        - chmod g+w $TUGBOAT_ROOT/project/vendor
         # Install Drupal using Drush.
         - |
           set -e