diff --git a/scripts/install b/scripts/install
index 438e4b6..d47b35b 100755
--- a/scripts/install
+++ b/scripts/install
@@ -103,9 +103,9 @@ popd
 ynh_add_config --template="../conf/user.css.example" --destination="$install_dir/public/dist/user.css"
 
 
-chgrp www-data -R $install_dir/storage $install_dir/public/dist $install_dir/public/sym $data_dir/uploads
-chmod -R 775 $install_dir/storage/* $install_dir/app/* $install_dir/public/dist $install_dir/public/sym $data_dir/uploads $install_dir/bootstrap/
-chmod 775 $install_dir/.
+chgrp $app -R $install_dir/storage $install_dir/public/dist $install_dir/public/sym $data_dir/uploads
+chmod -R 2775 $install_dir/storage/* $install_dir/app/* $install_dir/public/dist $install_dir/public/sym $data_dir/uploads $install_dir/bootstrap/
+chmod 2775 $install_dir/.
 
 #=================================================
 # END OF SCRIPT