diff --git a/rattail_fabric2/corepos.py b/rattail_fabric2/corepos.py
index b1a7872..4f160a3 100644
--- a/rattail_fabric2/corepos.py
+++ b/rattail_fabric2/corepos.py
@@ -104,9 +104,9 @@ def install_corepos(c, rootdir, rooturl_office, production=True,
                                 'mysql_name_prefix': mysql_name_prefix})
 
     # fannie logging
-    mkdir(c, '{}/fannie/logs'.format(is4c), use_sudo=True,
-          owner='{}:www-data'.format(user), mode='0775')
-    c.sudo('touch {}/fannie/logs/debug_fannie.log'.format(is4c),
+    mkdir(c, f'{is4c}/fannie/logs', use_sudo=True,
+          owner=f'{user}:www-data', mode='0775')
+    c.sudo(f"bash -c 'cd {is4c}/fannie/logs && touch fannie.log debug_fannie.log'",
            user='www-data')