diff --git a/backupbot.py b/backupbot.py
index 3501b23..89f27a1 100755
--- a/backupbot.py
+++ b/backupbot.py
@@ -84,7 +84,7 @@ def get_backup_cmds():
             container = container_by_service.get(s.name)
             if not container:
                 logging.error(
-                    "Container {s.name} is not running, hooks can not be executed")
+                    f"Container {s.name} is not running, hooks can not be executed")
             if prehook := labels.get('backupbot.backup.pre-hook'):
                 pre_commands[container] = prehook
             if posthook := labels.get('backupbot.backup.post-hook'):
@@ -107,7 +107,7 @@ def copy_secrets(apps):
                 app_secs := s.attrs['Spec']['TaskTemplate']['ContainerSpec'].get('Secrets')):
             if not container_by_service.get(s.name):
                 logging.error(
-                    "Container {s.name} is not running, secrets can not be copied.")
+                    f"Container {s.name} is not running, secrets can not be copied.")
                 continue
             container_id = container_by_service[s.name].id
             for sec in app_secs: