diff --git a/sau/services.py b/sau/services.py
index 344e69f..c4577d2 100644
--- a/sau/services.py
+++ b/sau/services.py
@@ -185,7 +185,7 @@ def restart_services():
         if get_deleted_open_files(proc):
             service = services[proc_name]
             policy = _get_service_restart_policy(service)
-            _warn(policy, '{} still has deleted files open'.format(proc, parent))
+            _warn(policy, f'{proc} still has deleted files open')
             recommend_restart = True
     return recommend_restart